本發明者等人對可使人輕鬆地呼吸，且於面罩內積極地產生經加溫之水蒸氣，使人吸入面罩內之絕對濕度經提高之空氣，藉此提昇潤濕喉或鼻之黏膜之效果這一課題進行了研究。 本發明者等人對上述專利文獻所記載之技術進行了研究，發現如專利文獻1之具有發熱功能之面罩由於目的在於加溫而並非積極地產生蒸氣，因此無法充分提高面罩內之絕對濕度。 又，於專利文獻2中，雖記載有發熱體產生水蒸氣，但設置發熱體之區域之面積相對於面罩面之面積之比率較低，有無法獲得充分之發熱效果及水蒸氣產生效果之傾向。 又，於專利文獻3中亦記載有發熱體產生水蒸氣。然而，其係以如下方式設計：將設置於發熱體之與配戴者側為相反側的片材之透氣性設定得較高，對發熱體積極地導入空氣中之氧氣，促進氧化反應，藉由所產生之水蒸氣使發熱體膨脹。因此，其係使面罩以柔軟之觸感密接於臉頰部或鼻部而消除間隙者，並非提高面罩內部之絕對濕度者。 進而，於專利文獻4中，記載有對肌膚供給大量水蒸氣之水蒸氣產生具，亦揭示有作為蒸氣面罩之使用方法。然而，其存在設置發熱體之區域之面積相對於面罩本體部之面積之比率較高的傾向，又，面罩本體部之基重較高而透氣性較低，因此於長時間配戴時會感到悶氣，於該方面存在改善之餘地。 因此，可知對於解決可使人輕鬆地呼吸，且於面罩內積極地產生經加溫之水蒸氣，使人吸入面罩內之絕對濕度經提高之空氣，藉此提昇潤濕喉或鼻之黏膜之效果這一課題，專利文獻1～4所揭示之技術均存在改善之餘地。 本發明者等人對上述課題之解決手段進行了研究，結果發現藉由採用水蒸氣產生體占面罩本體部之面積比率、及採用了特定之片材構成的水蒸氣產生體之構成，而可提供一種可使人輕鬆地呼吸，且可於面罩內積極地產生經加溫之水蒸氣，提高面罩內之絕對濕度，從而提昇喉或鼻之黏膜之潤濕感的蒸氣溫熱面罩。 根據本發明，提供一種可使人輕鬆地呼吸，且可於面罩內積極地產生經加溫之水蒸氣，提高面罩內之絕對濕度，從而提昇喉或鼻之黏膜之潤濕感的蒸氣溫熱面罩。 以下，使用圖式對本發明之實施形態進行說明。再者，於所有圖式中，對相同之構成要素標註相同之符號，並適當省略說明。 又，於本說明書中，只要未特別說明，則「～」表示以上至以下。 又，各實施形態所記載之構成、要素只要不損害發明之效果，則亦可適當組合。 又，於本實施形態中，片材等之透氣度可以如下方式測量。 透氣度係根據JIS P8117(2009年修訂版)測定之值，定義為於固定之壓力下100 ml之空氣通過6.42 cm2
之面積之時間。因此，透氣度之數值較大則意味著空氣通過花費時間較長、即透氣性較低。相反地，透氣度之數值較小則意味著透氣性較高。如此，透氣度之數值之大小與透氣性之高低表現出相反之關係。透氣度可藉由王研式透氣度計測量。 再者，本說明書中，將該透氣度成為30000秒/100 ml以上者視為「難透氣」，將成為80000秒/100 ml以上者視為「不透氣」。 (第1實施形態) 本實施形態中之蒸氣溫熱面罩為以下所示者。 一種蒸氣溫熱面罩，其具備： 面罩，其具備於配戴時覆蓋配戴者之鼻及口之面罩本體部、及設置於上述面罩本體部之左右兩端之一對掛耳部；及 水蒸氣產生體，其位於上述面罩本體部；且 相對於上述面罩本體部之上述配戴者側之面整體之面積，上述水蒸氣產生體所占面積之比率為30%以上且80%以下， 上述水蒸氣產生體係於內部收容水蒸氣產生部者， 上述水蒸氣產生體於上述水蒸氣產生部之上述配戴者側之面具備第1片材，且於上述水蒸氣產生部之與配戴者側之上述面為相反側之面具備第2片材， 上述第1片材之透氣度為7000秒/100 ml以下， 上述第2片材之透氣度超過8000秒/100 ml。 圖1係表示蒸氣溫熱面罩100之一例之立體圖。蒸氣溫熱面罩100係將面罩110與水蒸氣產生體120組合而成者。圖2係表示蒸氣溫熱面罩100之使用狀態之一例之圖。圖3係自配戴者側之面觀察第1實施形態中之面罩110之一部分之俯視圖。圖4係自上表面(配戴者之眼側)觀察第1實施形態中之面罩之一部分之剖視圖。 再者，於本實施形態中，蒸氣溫熱面罩100記載為面罩110與水蒸氣產生體120分離，可於收容體104中取放該水蒸氣產生體120者，但蒸氣溫熱面罩100亦可為於面罩110之收容體104內部封入水蒸氣產生體120者。 [面罩] 如圖1、2所示，面罩110具備於配戴時覆蓋鼻及口之面罩本體部101、及設置於該面罩本體部101之左右兩端之一對掛耳部102。 於本實施形態中，面罩110表示為於對應於配戴者之鼻樑之位置具有摺疊線103者，但亦可視用途等而設為不具有該摺疊線103之平坦形狀之面罩110。 以下，以具有該摺疊線103者為例示對面罩110之形狀進行說明。 於本實施形態中，面罩本體部101為片狀，更具體而言，由一片片材形成，且相對於摺疊線103呈左右對稱地摺疊。使用前，面罩本體部101成為沿摺疊線103山折而被摺疊為平面狀之狀態。 如圖1、2所示，摺疊線103為鼻部成為凸部之大致圓弧狀，上部與下部貼合。面罩本體部101係自與摺疊線103為相反側之邊打開，以重合有片材之內側之面成為配戴者側之面之方式被配戴。摺疊線103於配戴面罩110時向面罩本體部101之前方突出。若存在摺疊線103，則面罩本體部101之上部沿鼻之形狀而密接，因此不易產生間隙，可提高加溫加濕效果，自該方面而言較佳。 形成面罩本體部101之一片片材可為單一結構(即1層(ply))，或亦可為積層複數片片材而成之一體結構(即多層)。藉由使用複數片片材，而可對各片材賦予單獨之功能，藉此可對覆蓋部賦予各種功能，自該方面而言較佳。於使用複數片片材之情形時，各片材彼此可為整面接合之層壓狀態，亦可為片材間分開之狀態。又，於各片材間分開之狀態之情形時，各片材彼此之接合可沿覆蓋部之形狀而密封各片材之邊緣，亦可僅藉由點密封而接合邊緣之一部分。 於本實施形態中，例如如圖4所示，對面罩本體部101為單一結構之例進行說明。 面罩本體部101之材料可使用於面罩之技術領域中自先前起使用者，只要為具有一定之透氣性者則其種類並無特別限制。例如，可使用不織布或紗布等纖維片材，自加工之容易度或經濟性之觀點而言，較佳為使用不織布。作為不織布之纖維素材，例如較佳為包含選自PET(聚對苯二甲酸乙二酯)等聚酯；PE(聚乙烯)、PP(聚丙烯)、乙烯-丙烯共聚物等聚烯烴；嫘縈；棉等之1種或2種以上之纖維者。又，作為不織布，可使用利用上述1種或2種以上素材之纖維，藉由熱風法、紡黏法、針刺法、熔噴法、梳棉法、熱熔法、水刺法、溶劑接著法等而製造者。 自使自水蒸氣產生體120產生之水蒸氣滯留於面罩110內之觀點、及使呼吸輕鬆之觀點而言，面罩本體部101較佳為具有適度之透氣阻力。 具體而言，面罩本體部101之透氣阻力較佳為5 Pa以上，更佳為20 Pa以上，進而較佳為50 Pa以上。又，面罩本體部101之透氣阻力較佳為200 Pa以下，更佳為190 Pa以下，進而較佳為180 Pa以下。 又，面罩本體部101之透氣阻力較佳為5 Pa以上且200 Pa以下，更佳為20 Pa以上且190 Pa以下，進而較佳為50 Pa以上且180 Pa以下。再者，於面罩本體部101之結構為多層時，成為於將複數片片材全部重合之狀態下測定之透氣阻力。 面罩本體部101之透氣阻力可以如下方式測定。 如圖10所示，於面罩測試機MTS-2(柴田科學公司製造)之透氣阻力評價裝置本體70上部，配置自面罩本體部101之片材材料切出3.5～5 cm見方之尺寸所得之片材101a，藉由片材固定用治具71無遺漏地固定。測定係以試驗面積7 cm2
(內徑30 mm)、試驗流量10 L/min.進行10秒鐘，根據向片材101a之空氣流入側(入口側)與空氣流出側(出口側)之差壓而求出透氣阻力。 關於面罩本體部101之基重，自防止透視面罩110之內部之觀點或平衡良好地提高保溫性、柔軟性、厚度、片材強度之觀點而言，基重較佳為5 g/m2
以上，更佳為10 g/m2
以上，進而較佳為30 g/m2
以上，又，較佳為200 g/m2
以下，更佳為150 g/m2
以下，進而較佳為120 g/m2
以下。又，基重較佳為5 g/m2
以上且200 g/m2
以下，更佳為10 g/m2
以上且150 g/m2
以下，進而較佳為30 g/m2
以上且120 g/m2
以下。 於本實施形態中，蒸氣溫熱面罩100具備水蒸氣產生體120。水蒸氣產生體120可組入面罩本體部101中，又，亦可為於面罩本體部101具有固定水蒸氣產生體120之固定機構，於使用時固定該水蒸氣產生體120而使用，於本實施形態中為使用時固定者。於圖1、2所示之實施形態中，面罩本體部101係藉由密封部分107而於配戴者側之面設置有收容體104。收容體104取放自如地收容水蒸氣產生體120。藉此，可藉由於使用面罩110後，將水蒸氣產生體120替換為使用前者，而重複多次使用面罩110。 作為收容體104之形成方法，例如可如圖3所示，藉由密封部分107a而形成，該密封部分107a包圍沿橫向排列之2個水蒸氣產生體120之除上部以外之外周。具體而言，可列舉如下之方法等：於面罩本體部101之配戴者側之面重合構成收容體104之片材，藉由熱熔等而密封圖3所示之密封部分107a；或於製作面罩本體部101時，重合構成收容體104之片材，將面罩本體部101縱中心部之摺疊線103之部分密封，其後將圖3所示之密封部分107a密封。藉此，可形成可自面罩本體101之上方插入水蒸氣產生體120之袋狀收容體104。 再者，收容體104之形成方法並不限定於此。圖5、圖6係自配戴者側之面觀察第1實施形態中之面罩之變化例之俯視圖。即，如圖5、6所示，收容體104亦可藉由密封部分107b、密封部分107c而形成，該等密封部分107b、密封部分107c於固定水蒸氣產生體120之下方之一部分之位置，固著有構成面罩本體部101之片材、及構成收容體104之片材。於圖5中，表示有密封部分107b，其包含沿面罩本體部101之中央部橫向、且以與水蒸氣產生體120之下方相接之方式延伸的直線、及沿水蒸氣產生體120之掛耳部102側之側面下部之一部分延伸的縱向之直線。於圖6中，表示有密封部分107c，其為沿較面罩本體部101之中央部稍上方之橫向、且沿水蒸氣產生體120之下部之形狀而變形的直線狀。 於本實施形態中，自可於特定位置將水蒸氣產生體120固定於面罩本體部101，而容易對配戴者之鼻至臉頰之面罩110內之空間進行加溫加濕的方面而言，較佳為收容體104係固定於面罩本體部101之摺疊線103附近及面罩本體部101之上端部附近。 於本實施形態中，收容體104於上端部或掛耳部102側以可取放水蒸氣產生體120之方式具有開口部，其他端部係固定於面罩本體部101。開口部之位置並無特別限定，只要於配戴面罩110時不使水蒸氣產生體120露出收容體104外即可。又，收容體104之大小只要為可收容水蒸氣產生體120並固定水蒸氣產生體120之位置者即可。 收容體104具有透氣性，可設為與面罩本體部101相同之材料。自防止過度發熱，並對面罩110內有效地賦予水蒸氣產生體120所產生之加溫加濕性能之觀點而言，收容體104之透氣阻力較佳為1 Pa以上且100 Pa以下，更佳為1 Pa以上且50 Pa以下，進而較佳為1 Pa以上且30 Pa以下。 掛耳部102係成對使用，分別設置於面罩本體部101之長邊方向(X方向)之左右端部。 於本實施形態中，如圖1、2所示，對掛耳部102係將如橡皮繩般具有伸縮性之繩狀材料形成於面罩本體部101之端部之例進行說明，但亦可使用與面罩本體部101成為一體之具有伸縮性之構件。 掛耳部102可為與面罩本體部101相同之材料，亦可為不同之材料。 [水蒸氣產生體] 水蒸氣產生體120係安裝於面罩本體部101。 經本發明者等人研究發現：將該水蒸氣產生體120之平面形狀之面積相對於面罩本體部101之配戴者側之面整體之面積設定為特定比率，並且對於該水蒸氣產生體120，使用具有特定透氣度之片材構成，藉此可適當地使所產生之水蒸氣滯留於面罩110內部，且可確保面罩110之透氣性為不會使配戴者悶氣之程度。 自可於面罩使用時提高面罩110內部之絕對濕度之觀點而言，相對於面罩本體部101之配戴者側之面整體之面積，水蒸氣產生體120所占面積之比率為30%以上，較佳為40%以上，更佳為45%以上。 又，自作為面罩110確保適當之透氣性之觀點而言，相對於面罩本體部101之配戴者側之面整體之面積，水蒸氣產生體120所占面積之比率為80%以下，較佳為70%以下，更佳為65%以下。 自相同之觀點而言，相對於面罩本體部101之配戴者側之面整體之面積，水蒸氣產生體120所占面積之比率為30%以上且80%以下，較佳為40%以上且70%以下，更佳為45%以上且65%以下。 此處，面罩本體部101之配戴者側之面整體之面積係指構成面罩本體部101之片材之整個區域，且係指包含所具備之水蒸氣產生體120之區域在內之面之整個區域，不包含掛耳部102。 更具體而言，係指下述B線至C線之部分：將面罩於中央部縱向摺疊時，將連結上下最遠離之點之線設為A線，將垂直地向前端部方向最遠離該A線之摺疊線上之點設為面罩前端，B線為通過該面罩前端之與上述A線平行之線，C線為向掛耳方向平行地離開該B線7 cm之線。又，於面罩前端之摺疊部分係藉由熱密封等密接之情形時，將該密封寬度部分之掛耳側之端設為前端而測定距離。進而，於褶型面罩之情形時，於將面罩上下撐開而將面罩中央部之折縫部分撐開之狀態下，左右對稱地摺疊而測定上述距離，此時自面罩前端至掛耳側所殘留之褶之折縫部分不計入面積。 再者，即便於掛耳部102包含纖維片材等之情形時，該區域亦不計入該面罩本體部101之配戴者側之面整體之面積。 另一方面，水蒸氣產生體120之面積係指下述收容水蒸氣產生部121之袋體122之平面形狀下之面積，且係指亦包含構成袋體之片材之密封部分之面積。 於本實施形態中，水蒸氣產生體120係安裝於面罩本體部101。自配戴時於面罩本體部101之肌膚側產生由鼻部與臉頰部之間之臉部之凹處及水蒸氣產生體120包圍之空間，不抑制水蒸氣產生而提高面罩110內之溫度與絕對濕度的觀點而言，水蒸氣產生體120之位置較佳為如圖1、2所示，左右對稱地安裝於面罩本體部101之摺疊線103附近及面罩本體部101之上端附近。摺疊線103附近及面罩本體部101之上端部附近不限定於與摺疊線103及面罩本體部101之上端部相接之情形，而表示摺疊線103及面罩本體部101之上端部周圍之區域，且係安裝於面罩本體部101之水蒸氣產生體120覆蓋配戴者之鼻部之區域。又，水蒸氣產生體120亦可到達配戴者之臉頰部，自配戴時於面罩本體部101之肌膚側產生由鼻部與臉頰部之間之臉部之凹處及水蒸氣產生體120包圍之空間，不抑制水蒸氣產生而提高面罩110內之溫度與絕對濕度的觀點而言，較佳為並非僅覆蓋臉頰部者。 關於水蒸氣產生體120之位置，自配戴面罩110時不抑制水蒸氣產生而提高面罩110內之溫度與絕對濕度之觀點而言，於水蒸氣產生體120之鼻側端部為直線狀之情形時，該直線之兩端距摺疊線103之各最短距離之平均值較佳為15 mm以下，更佳為10 mm以下，進而較佳為5 mm以下，又，於水蒸氣產生體120之鼻側端部為曲線狀之情形時，該曲線距摺疊線103之最短距離較佳為15 mm以下，更佳為10 mm以下，進而較佳為5 mm以下。又，關於水蒸氣產生體120之位置，自相同之觀點而言，水蒸氣產生體120之上側端部距面罩本體部101之上端部的最短距離較佳為15 mm以下，更佳為10 mm以下，進而較佳為5 mm以下。 又，水蒸氣產生體120之平面形狀並無特別限定，亦可為圓形、多邊形等。自製造效率、操作容易度、加溫加濕效果之觀點而言，較佳為長方形、大致正方形等四邊形，自操作容易度之觀點而言更佳為大致正方形。又，於水蒸氣產生體120之鼻側端部為直線狀之情形時，較佳為面罩本體部101之摺疊線103之與水蒸氣產生體120相接之部分為直線狀。 又，自保持面罩之形狀、提昇面罩內部之絕對濕度之觀點、以及防止因面罩伴隨吸氣貼附於鼻周邊之肌膚而妨礙透氣所導致之悶氣的觀點而言，該水蒸氣產生體120之藉由以下之條件測定之垂直方向之剛性值較佳為30 gf/60 mm寬以上，更佳為60 gf/60 mm寬以上，進而較佳為70 gf/60 mm寬以上。 又，自使配戴時之配戴感良好之觀點而言，該水蒸氣產生體120之垂直方向之剛性值較佳為150 gf/60 mm寬以下，更佳為130 gf/60 mm寬以下，進而較佳為120 gf/60 mm寬以下。 又，該水蒸氣產生體120之藉由以下之條件測定之垂直方向之剛性值較佳為30 gf/60 mm寬以上且150 gf/60 mm寬以下，更佳為60 gf/60 mm寬以上且130 gf/60 mm寬以下，進而較佳為70 gf/60 mm寬以上且120 gf/60 mm寬以下。 [剛性值測定條件] 使用Tensilon萬能試驗機(ORIENTEC RTC-1150A)，以跨距間距離30 mm支持水蒸氣產生體，藉由寬度60 mm、前端半徑5 mm之板狀按壓構件，於試驗片(水蒸氣產生體)之中央部以十字頭速度20 mm/min施加負荷。將此時之峰值荷重(3次測量之平均值)設為剛性值。 再者，該測定可將水蒸氣產生體120本身設為測定樣品，亦可將收容有該水蒸氣產生體120之面罩110設為測定樣品。 如圖9所示，水蒸氣產生體120於內部收容有水蒸氣產生部121。於本實施形態中，水蒸氣產生體120具有水蒸氣產生部121、及收容其之袋體122。袋體122於配戴者側(肌膚側)之面具備第1片材122A，且於與配戴者側(肌膚側)之面為相反側之面具備第2片材122B。 再者，水蒸氣產生體120藉由與空氣中之氧氣進行反應，而一面產生水蒸氣一面發熱。 於將水蒸氣產生體120設為可相對於面罩110裝卸之態樣之情形時，水蒸氣產生體120於使用前係裝於氧氣遮斷袋中。 氧氣遮斷袋之整體具有氧氣阻隔性，使水蒸氣產生體120不與空氣中之氧氣接觸。作為氧氣遮斷袋之氧氣阻隔性之材料，例如其氧氣透過係數(ASTM D3985)為10 cm3
・mm/(m2
・day・MPa)以下、尤其為2 cm3
・mm/(m2
・day・MPa)以下者較佳。具體而言，可列舉乙烯-乙烯醇共聚物或聚丙烯腈等之膜、或於此種膜蒸鍍陶瓷或鋁等而成之膜等。 又，於採用對面罩110封入水蒸氣產生體120之態樣之情形時，只要將該面罩110整體封入氧氣遮斷袋中，避免水蒸氣產生體120與空氣中之氧氣接觸即可。 水蒸氣產生部121可採用各種形態。水蒸氣產生部121例如可為粉體之混合物、抄製片材等片狀、或於基材塗佈分散液等而成之塗佈片材之任一者。 水蒸氣產生部121可列舉包含被氧化性金屬、吸水劑、水、電解質、及其他視需要之反應促進劑等之態樣。 當水蒸氣產生部121與空氣接觸時，其中包含之被氧化性金屬發生氧化反應，從而產生熱。藉由該熱而水蒸氣產生部121所包含之水被加熱，成為特定溫度之水蒸氣，通過袋體122而釋放至外部。水蒸氣係自袋體122中之透氣性部位釋放至外部。 被氧化性金屬為產生氧化反應熱之金屬，例如可列舉選自鐵、鋁、鋅、錳、鎂、及鈣之1種或2種以上之粉末或纖維。其中，自操作性、安全性、製造成本、保存性及穩定性之方面而言，較佳為鐵粉。作為鐵粉，例如可列舉選自還原鐵粉及霧化鐵粉之1種或2種以上。 於被氧化性金屬為粉末之情形時，自有效率地進行氧化反應之觀點而言，較佳為其平均粒徑為0.1 μm以上，更佳為10 μm以上，進而較佳為20 μm以上。自相同之觀點而言，較佳為300 μm以下，更佳為200 μm以下，進而較佳為150 μm以下。 進而，自使塗佈性良好之觀點而言，較佳為平均粒徑為10 μm以上且200 μm以下，更佳為平均粒徑為20 μm以上且150 μm以下。 又，自使對纖維狀物等保水材之固定性、及反應之控制良好之觀點而言，亦較佳為使用含有粒徑為0.1～150 μm者50質量%以上之被氧化性金屬。 再者，被氧化性金屬之粒徑係指粉體之形態下之最大長度，係藉由利用篩之分級、動態光散射法、雷射繞射-散射法等而測定。 水蒸氣產生部121中之被氧化性金屬之含量以基重表示較佳為100 g/m2
以上，更佳為200 g/m2
以上。又，水蒸氣產生部121中之被氧化性金屬之含量以基重表示較佳為3000 g/m2
以下，更佳為1600 g/m2
以下。 又，較佳為100 g/m2
以上且3000 g/m2
以下，進而較佳為200 g/m2
以上且1600 g/m2
以下。藉此，可使水蒸氣產生體120之發熱溫度上升至所期望之溫度。 此處，被氧化性金屬之含量可藉由依照JIS P8128之灰分試驗、或熱重量測定器求出。除此以外，可利用當施加外部磁場時產生磁化之性質，藉由振動試樣型磁化測定試驗等而定量。 作為吸水劑，只要為可保持水者則其種類並無特別限制，例如可列舉選自碳成分、纖維狀物、吸水性聚合物、及吸水性之粉體之1種或2種以上。吸水劑係根據水蒸氣產生部121之形態而使用適當者。 作為碳成分，可使用具有保水能力、氧氣供給能力、及觸媒能力者，例如可使用選自活性碳、乙炔黑、及石墨之1種或2種以上。其中，較佳為活性碳，更佳為選自椰子殼碳、木粉碳、及泥碳之1種或2種以上之微細之粉末狀物或小粒狀物。其中，自獲得良好之加溫加濕效果之觀點而言，進而較佳為木粉碳。 吸水劑較佳為平均粒徑為10 μm以上，進而較佳為12 μm以上。又，吸水劑較佳為平均粒徑為200 μm以下，進而較佳為100 μm以下。 又，吸水劑較佳為平均粒徑為10 μm以上且200 μm以下，更佳為平均粒徑為12 μm以上且100 μm以下。 再者，吸水劑之平均粒徑係指粉體之形態下之最大長度，係藉由動態光散射法、雷射繞射法等而測定。碳成分較佳為使用粉體狀之形態者，亦可使用粉體狀以外之形態者，例如亦可使用纖維狀之形態者。 作為纖維狀物，可並無特別限制地使用天然或合成之纖維狀物。 作為天然之纖維狀物，例如可列舉棉、木棉、木漿、非木漿、花生蛋白纖維、玉米蛋白纖維、大豆蛋白纖維、甘露聚糖纖維、橡膠纖維、麻、馬尼拉麻、瓊麻、紐西蘭麻、羅布麻、椰子、燈心草、麥稈等植物纖維。又，可列舉羊毛、山羊毛、馬海毛、開司米山羊絨、阿爾帕卡毛、安哥拉毛、駱駝毛、駱馬毛、絲綢、羽毛、絨毛、羽毛(feather)、海藻糖纖維、甲殼素纖維、酪蛋白纖維等動物纖維。進而可列舉石棉等礦物纖維。 另一方面，作為合成之纖維狀物，例如可列舉嫘縈、黏液嫘縈、銅氨纖維、乙酸酯、三乙酸酯、氧化乙酸酯、Promix、氯化橡膠、鹽酸橡膠等半合成纖維。又，可列舉尼龍、芳族聚醯胺、聚乙烯醇、聚氯乙烯、聚偏二氯乙烯、以及聚對苯二甲酸乙二酯等聚酯、聚丙烯腈、丙烯酸系樹脂、聚乙烯、聚丙烯、聚苯乙烯、聚胺基甲酸酯等合成高分子纖維。進而，亦可使用金屬纖維、碳纖維、玻璃纖維等。該等纖維亦可單獨使用或混合使用。該等中，自與被氧化性金屬或反應促進劑之固定性、水蒸氣產生部121之柔軟性、氧氣透過性、片材形態之維持功能、製造成本等之方面而言，較佳為使用木漿、棉、聚乙烯纖維、聚酯纖維。又，木漿、棉具有擔載、固定化鐵粉等固體物之功能。 作為吸水性聚合物，可列舉可吸收、保持自重之20倍以上之液體之具有交聯結構之親水性聚合物等。 作為吸水性之粉體，可列舉選自蛭石、矽酸鈣、鋸屑、氧化鋁、矽膠、及紙漿粉末之1種或2種以上。 於水蒸氣產生部121為片狀之情形時，較佳為使用纖維狀物作為吸水劑。其理由在於，纖維狀物兼具作為保水材之功能、及使水蒸氣產生部121維持片材形態之功能。其結果為，不易發生被氧化性金屬之偏集，水蒸氣產生部121之發熱溫度分佈變得均勻。 於水蒸氣產生部121為包含粉體之混合物之情形時，較佳為使用高吸收性聚合物、蛭石、矽酸鈣、矽膠、氧化矽系多孔質物質、氧化鋁、木粉等作為吸水劑。 吸水劑之含量相對於被氧化性金屬100質量份，較佳為0.3質量份以上，更佳為1質量份以上，進而較佳為3質量份以上。又，吸水劑之含量相對於被氧化性金屬100質量份，較佳為100質量份以下，更佳為80質量份以下，進而較佳為60質量份以下。 又，吸水劑之含量相對於被氧化性金屬100質量份，較佳為0.3質量份以上且100質量份以下，更佳為1質量份以上且80質量份以下，進而較佳為3質量份以上且60質量份以下。藉此，於所得之水蒸氣產生體120中可儲存使氧化反應持續進行所必需之水分。又，可充分獲得對水蒸氣產生部121之氧氣供給而獲得發熱效率較高之水蒸氣產生體120。又，可將相對於所得之發熱量之水蒸氣產生體120之熱容量抑製得較小，因此可使發熱溫度上升變大，獲得所期望之溫度上升，從而促進發熱反應。 再者，吸水劑之含量以基重表示較佳為4 g/m2
以上且290 g/m2
以下，進而較佳為7 g/m2
以上且160 g/m2
以下。藉此，可使水蒸氣產生部121之厚度較薄，作為製品體積不過大，具有柔軟性。例如可將水蒸氣產生部121之厚度設為0.1 mm以上且2 mm以下。 作為電解質，例如可列舉鹼金屬、鹼土類金屬或過渡金屬之硫酸鹽、碳酸鹽、氯化物或氫氧化物等。該等中，自導電性、化學穩定性、生產成本優異之方面而言，較佳為使用鹼金屬、鹼土類金屬或過渡金屬之氯化物，尤其較佳為使用氯化鈉、氯化鉀、氯化鈣、氯化鎂、氯化亞鐵、氯化鐵。 水蒸氣產生部121包含水。水可為來自電解質水溶液(例如鹼金屬、鹼土類金屬等之水溶液)者，又，亦可為單獨以水添加至水蒸氣產生部121者，並無特別限定。 水蒸氣產生部121中之水分量相對於被氧化性金屬100質量份，較佳為35質量份以上且200質量份以下。藉由將水蒸氣產生部121之水分量設為相對於被氧化性金屬100質量份為200質量份以下，而使水蒸氣產生部121良好地發熱，使發熱溫度之上升變快(升溫時間變快)。又，藉由將水蒸氣產生部121之水分量設為相對於被氧化性金屬100質量份為35質量份以上，而可確保水蒸氣產生部121之發熱反應所必需之水分量，從而可使水蒸氣產生部121之發熱反應良好地持續。 如此，藉由將水蒸氣產生部121之水分量設為相對於被氧化性金屬100質量份為35質量份以上且200質量份以下，而可成為良好之發熱狀態之水蒸氣產生部121。即，水蒸氣產生部121之水分量影響發熱速度。藉由相對於被氧化性金屬100質量份將水分量設為35質量份以上且200質量份以下而良好地進行發熱，使發熱溫度之上升變快，使發熱溫度持續。 自相同之觀點而言，水蒸氣產生部121之水分量相對於被氧化性金屬100質量份，更佳為40質量份以上，進而較佳為50質量份以上。又，水蒸氣產生部121之水分量相對於被氧化性金屬100質量份，較佳為200質量份以下，更佳為150質量份以下，進而較佳為100質量份以下，進而較佳為80質量份以下。 又，水蒸氣產生部121之水分量相對於被氧化性金屬100質量份，更佳為40質量份以上且150質量份以下，進而較佳為50質量份以上且100質量份以下，進而較佳為50質量份以上且80質量份以下。 水蒸氣產生部121除包含上述各成分以外，亦可包含增黏劑、界面活性劑、藥劑、凝聚劑、著色劑、造紙增強劑(paper strengthening agent)、pH值調整劑(例如磷酸三鉀等)、蓬鬆劑等。 作為增黏劑，可使用吸收水分而使稠度增大、或賦予觸變性之物質，可使用選自海藻酸鈉等海藻酸鹽、阿拉伯膠、黃蓍膠、刺槐豆膠、瓜爾膠、角叉菜膠、瓊脂、三仙膠等多糖類系增黏劑；糊精、α化澱粉、加工用澱粉等澱粉系增黏劑；羧甲基纖維素、乙酸乙酯纖維素、羥乙基纖維素、羥甲基纖維素或羥丙基纖維素等纖維素衍生物系增黏劑；聚乙烯醇(PVA)等增黏劑；硬脂酸鹽等金屬皂系增黏劑；膨潤土等礦物系增黏劑等之1種或2種以上之混合物。其中，自使水蒸氣產生部121中之水分量維持固定之觀點而言，較佳為多糖類系增黏劑，且較佳為三仙膠。 於水蒸氣產生部121為塗佈片材之情形時，自塗佈容易度之方面而言，增黏劑之含量相對於被氧化性金屬100質量份，較佳為0.1質量份以上，更佳為0.2質量份以上。又，增黏劑之含量相對於被氧化性金屬100質量份，較佳為5質量份以下，更佳為4質量份以下。而且，增黏劑之含量相對於被氧化性金屬100質量份，較佳為0.1質量份以上且5質量份以下，更佳為0.2質量份以上且4質量份以下。 又，於水蒸氣產生部121為片狀之情形時，較佳為形成有多個孔及/或切口。藉此，即便片狀之水蒸氣產生部121較薄亦可獲得充分高之發熱特性，從而可獲得所期望之水蒸氣釋放特性。自獲得充分之發熱特性而言，該孔之面積較佳為0.01～10 mm2
，尤佳為0.1～8 mm2
。出於相同之理由，孔於片狀之水蒸氣產生部121較佳為形成有0.1～20個/cm2
，尤佳為形成有1～15個/cm2
。孔之形狀例如可列舉圓形、矩形、多邊形、橢圓形、長圓形或該等之2種以上之組合等。另一方面，於形成切口之情形時，其長度較佳為1～50 mm，尤佳為5～30 mm。 水蒸氣產生部121係收容於水蒸氣產生體120之具備第1片材122A及第2片材122B之袋體122中。即，水蒸氣產生體120係包含第1片材122A及第2片材122B而構成，藉由將該等第1片材122A與第2片材122B之周緣部較佳為進行密閉接合而構成袋體122。第1片材122A與第2片材122B之周緣部以外之區域為非接合區域，於非接合區域內配置水蒸氣產生部121。 於本實施形態中，對該水蒸氣產生部121採用以下之構成。 即，於水蒸氣產生體120中，於水蒸氣產生部121之配戴者側之面配置第1片材122A，該第1片材122A之透氣度為7000秒/100 ml以下，又，於水蒸氣產生部121之與配戴者側之面為相反側之面上配置第2片材122B，該第2片材122B之透氣度超過8000秒/100 ml。 以下對該等構成進行詳細敍述。 於本實施形態中，水蒸氣產生體120之位於配戴者側之面成為第1片材122A。 此處，第1片材122A之透氣度為7000秒/100 ml以下。自保持由水蒸氣產生體120與鼻部及臉頰部之間之臉之凹處所包圍之空間，確保透氣性，並且使來自水蒸氣產生體120之水蒸氣容易大量釋放至袋體122外部的觀點而言，第1片材122A之透氣度較佳為5000秒/100 ml以下，更佳為2500秒/100 ml以下，進而較佳為1000秒/100 ml以下，進而較佳為600秒/100 ml以下，進而較佳為10秒/100 ml以下，進而較佳為5秒/100 ml以下，進而更佳為0秒/100 ml。 作為具有此種透氣度之第1片材122A，例如較佳為使用雖具有透濕性但不具有透水性之合成樹脂製多孔性片材。具體而言，可使用使聚乙烯含有碳酸鈣等並延伸而成之膜。於使用該多孔性片材之情形時，亦可於多孔性片材之外表面層壓以選自針刺不織布、熱風不織布、及紡黏不織布之1種或2種以上之不織布為代表之各種纖維片材，而提高第1片材122A之質感。 又，第1片材122A只要滿足上述之透氣度，則其一部分亦可為不具有透氣性之不透氣性片材。 第2片材122B之一部分可為具有透氣性之透氣性片材，亦可為不具有透氣性之不透氣性片材，整體而言採用透氣性較低之片材。具體而言，作為該第2片材122B之透氣度，採用超過8000秒/100 ml之條件，自可有效地對面罩本體部101內穩定地加溫加濕之觀點而言，較佳為不透氣性片材。 第2片材122B只要滿足上述之透氣度，則亦可視用途為一層或多層之合成樹脂製膜、或於該一層或多層之合成樹脂製膜之外表面層壓以選自針刺不織布、熱風不織布、及紡黏不織布之1種或2種以上之不織布為代表之各種纖維片材，而提高第2片材122B之質感。具體而言，使用包含聚乙烯膜及聚對苯二甲酸乙二酯膜之2層膜、包含聚乙烯膜及不織布之層壓膜、包含聚乙烯膜及紙漿片材之層壓膜等，特佳為包含聚乙烯膜及紙漿片材之層壓膜。 第2片材122B只要滿足上述之透氣度之值，則可使用與第1片材122A相同之素材，或可使用不同之素材。 又，第2片材122B之透氣性較佳為設為10000秒/100 ml以上，更佳為設為30000秒/100 ml以上，更佳為設為80000秒/100 ml以上。藉由如此設定第2片材122B之透氣性，而可使水蒸氣產生部121所產生之蒸氣高效率地自第1片材122A側釋放，從而可抑制水蒸氣產生體120之膨脹。 其中，自使被氧化性金屬之氧化反應良好，容易自第1片材122A側產生大量水蒸氣之觀點而言，特佳為將第1片材122A之透氣度設為2500秒/100 ml以下，且將第2片材122B之透氣度設為80000秒/100 ml以上。 於該情形時，於水蒸氣產生部121之與位於配戴者側之面為相反側之面上、即自水蒸氣產生部121至水蒸氣產生體120之與配戴者為相反側之最外層之間配置有不透氣性或難透氣性之片材、更佳為不透氣性之片材。藉此，可抑制藉由水蒸氣產生部121產生之水蒸氣洩漏至面罩110之外部，從而對面罩110內部、即配戴者側賦予水蒸氣。 以下，對水蒸氣產生部121之製造方法之例進行說明。 於水蒸氣產生部121例如為片狀之情形時，例如可使用本申請人之先前之申請案即日本專利特開2003-102761號公報所記載之濕式抄製法、或使用模嘴塗佈機之擠壓塗佈法。於該情形時，首先，藉由濕紙抄製法形成包含被氧化性金屬、吸水劑及反應促進劑之成形片材，並對該成形片材添加電解質水溶液，藉此而獲得片狀之水蒸氣產生部121。所得之片狀之水蒸氣產生部121可使用1片，或亦可重疊複數片使用。或亦可將1片水蒸氣產生部121摺疊，重疊經摺疊之複數片水蒸氣產生部121而使用。 於水蒸氣產生部121包含粉體之情形時，藉由將構成材料均勻混合，而獲得粉體之水蒸氣產生部121。更具體而言，首先，將高吸收性聚合物等吸水劑與被氧化性金屬均勻混合，於其中添加電解質水溶液，使被氧化性金屬附著於吸水劑之表面。其後，藉由添加作為剩餘材料之反應促進劑等而製備水蒸氣產生部121。藉由如此製備水蒸氣產生部121，而使氧化反應之上升時間變快，每單位時間之水蒸氣之蒸散量容易成為最大。 又，於水蒸氣產生部121包含塗佈片材之情形時，例如亦可為藉由本申請人之先前之申請案即日本專利特開2013-146554號公報所記載之方法，於保水片材塗佈發熱粉體水分散液，將具備發熱層及保水片材之發熱物之連續長條物裁斷為任意大小所得者。水蒸氣產生部121可以1片、亦可以積層複數片之多層狀態收容。 此處，對水蒸氣產生部121包含塗佈片材之情形時之水蒸氣產生體120之構成進行以下說明。 如圖9所示，水蒸氣產生部121於基材層121B與保水片材121C之間包含水蒸氣產生層121A。水蒸氣產生層121A與保水片材121C直接接觸。水蒸氣產生體120於具有第1片材122A及第2片材122B之袋體122內，以保水片材121C側、即第1片材122A側位於配戴者之肌膚側，且基材層121B配置於第2片材122B側之方式具備水蒸氣產生部121。藉此可將來自水蒸氣產生部121之蒸氣自第1片材122A高效率地排出。 再者，水蒸氣產生層121A可設置於保水片材121C之一面，亦可以夾於保水片材121C及基材層121B之形式設置。於圖9中，表示水蒸氣產生層121A以夾於保水片材121C與基材層121B之形式設置之例。 保水片材121C含有水。水之含量例如可設為該保水片材121C之最大吸水量之10質量%以上且45質量%以下。 保水片材121C之最大吸水量可以如下之方式計算出。 測定將保水片材121C切割為25 cm2
之尺寸後之質量(W0
)後，浸漬於5質量%氯化鈉水溶液中5分鐘。以鑷子取出，於空氣中垂吊放置1分鐘而使多餘之水分滴落後，測定質量(W1
)，藉由下述式計算出最大吸水量(Wmax
)。 Wmax
＝W1
－W0
又，保水片材121C所包含之水分量以基重表示較佳為50～350 g/m2
，進而更佳為180～260 g/m2
。由於保水片材121C所包含之水分量成為水蒸氣產生源，因此藉由將保水片材121C所包含之水分量以基重表示較佳為設為50 g/m2
以上，而可確保良好之蒸氣產生量。又，保水片材121C會因吸水而產生透氣阻力(因吸水膨潤而與乾燥時相比透氣性下降)。因此，藉由以基重表示較佳為設為350 g/m2
以下，而可使蒸氣容易自保水片材121C釋放，而且由於充分確保向水蒸氣產生層121A之透氣性，因此可充分獲得氧氣供給而獲得發熱效率較高之水蒸氣產生體120。 又，保水片材121C之透氣度以包含水分之狀態之透氣度計較佳為500秒/100 ml以下，考慮到透氣性、及蒸氣之透過容易度，則更佳為300秒/100 ml以下，進而較佳為50秒/100 ml以下。 再者，包含水分之狀態(即，水分量為該保水片材121C之最大吸水量之15質量%以上且30質量%以下)之透氣度下限值例如為1秒/100 ml。 此處，作為保水片材121C，使用可吸收保持水分，且具有柔軟性之片材材料。作為此種材料，例如可列舉以纖維為原料之紙、不織布、梭織物、編織物等纖維片材。又，可列舉海綿等多孔體等。作為上述纖維，例如可列舉以植物纖維或動物纖維等天然纖維為主成分者或以化學纖維為主成分者。作為植物纖維，例如可列舉選自棉、木棉、木漿、非木漿、花生蛋白纖維、玉米蛋白纖維、大豆蛋白纖維、甘露聚糖纖維、橡膠纖維、麻、馬尼拉麻、瓊麻、紐西蘭麻、羅布麻、椰子、燈心草、麥稈之1種或2種以上。作為動物纖維，例如可列舉選自羊毛、山羊毛、馬海毛、開司米山羊絨、阿爾帕卡毛、安哥拉毛、駱駝毛、駱馬毛、絲綢、羽毛、絨毛、羽毛(feather)、海藻糖纖維、甲殼素纖維、酪蛋白纖維之1種或2種以上。作為化學纖維，例如可列舉選自嫘縈、乙酸酯、纖維素之1種或2種以上。 其中，作為保水片材121C，較佳為含有包含上述纖維之纖維材料、及吸水性之聚合物者。 作為吸水性聚合物，較佳為使用可吸收、保持自重之20倍以上之液體且可凝膠化之水凝膠材料，其原因在於，可將保水片材121C所包含之水之含量維持為保水片材121C之最大吸水量之15～30質量%。 作為吸水性聚合物之粒子之形狀，可列舉球狀、塊狀、葡萄串狀、纖維狀等。 又，自製造時之操作容易度之觀點而言，吸水性聚合物之粒子之粒徑較佳為1 μm以上，更佳為10 μm以上。又，自吸水速度之觀點而言，吸水性聚合物之粒子之粒徑較佳為1000 μm以下，更佳為500 μm以下。 又，吸水性聚合物之粒子之粒徑較佳為1 μm以上且1000 μm以下，更佳為10 μm以上且500 μm以下。 再者，吸水性聚合物粒子之粒徑係藉由動態光散射法、雷射繞射法等測定。 作為吸水性聚合物之具體例，可列舉選自澱粉、交聯羧甲基化纖維素、丙烯酸或丙烯酸鹼金屬鹽之聚合物或共聚物等、聚丙烯酸及其鹽以及聚丙烯酸鹽接枝聚合物之1種或2種以上。其中，較佳為使用丙烯酸或丙烯酸鹼金屬鹽之聚合物或共聚物等、聚丙烯酸及其鹽以及聚丙烯酸鹽接枝聚合物。 基材層121B係設置於水蒸氣產生層121A之與保水片材121C為相反側之表面。基材層121B與水蒸氣產生層121A直接接觸，被覆水蒸氣產生層121A。該基材層121B較佳為不透氣性或難透氣性之片材，例如較佳為使用樹脂片材。藉由設為不透氣性或難透氣性之片材(50000秒/100 ml以上，較佳為80000秒/100 ml以上)，不僅可使蒸氣自保水片材121C側更確實地釋放，而且可防止氣化熱被基材層121B側奪走。 作為基材層121B，例如可列舉合成樹脂膜，且可列舉聚乙烯膜、聚對苯二甲酸乙二酯膜等。 再者，於將保水片材121C形成於水蒸氣產生層121A上，且未設置基材層121B之情形時，有水蒸氣產生部121與第2片材122B直接接觸之可能性，因此較佳為第2片材122B係設為具有耐水性之片材。 自對面罩配戴者賦予適度之蒸氣感之觀點而言，本實施形態之水蒸氣產生體120之水蒸氣產生量作為水蒸氣產生體120整體，較佳為30 mg/單元・10 min以上，更佳為50 mg/單元・10 min以上，進而較佳為150 mg/單元・10 min以上，進而較佳為250 mg/單元・10 min以上，進而更佳為300 mg/單元・10 min以上。 又，自抑止面罩中之結露之觀點而言，本實施形態之水蒸氣產生體120之水蒸氣產生量作為水蒸氣產生體120整體，較佳為1200 mg/單元・10 min以下，更佳為1000 mg/單元・10 min以下，進而較佳為800 mg/單元・10 min以下，進而較佳為700 mg/單元・10 min以下，進而更佳為500 mg/單元・10 min以下。 又，本實施形態之水蒸氣產生體120之水蒸氣產生量作為水蒸氣產生體120整體，較佳為30 mg/單元・10 min以上且1200 mg/單元・10 min以下，更佳為50 mg/單元・10 min以上且1000 mg/單元・10 min以下，進而較佳為150 mg/單元・10 min以上且800 mg/單元・10 min以下，進而較佳為250 mg/單元・10 min以上且700 mg/單元・10 min以下，進而更佳為300 mg/單元・10 min以上且500 mg/單元・10 min以下。 又，自對面罩配戴者賦予適度之蒸氣感之觀點而言，本實施形態之水蒸氣產生體120之每單位面積之水蒸氣產生量作為水蒸氣產生體120整體，較佳為1 mg/cm2
・10 min以上，更佳為1.5 mg/cm2
・10 min以上，進而較佳為5 mg/cm2
・10 min以上，進而較佳為7 mg/cm2
・10 min以上，進而更佳為9 mg/cm2
・10 min以上。 又，自抑止面罩中之結露之觀點而言，本實施形態之水蒸氣產生體120之每單位面積之水蒸氣產生量作為水蒸氣產生體120整體，較佳為20 mg/cm2
・10 min以下，更佳為18 mg/cm2
・10 min以下，進而較佳為15 mg/cm2
・10 min以下。 又，本實施形態之水蒸氣產生體120之每單位面積之水蒸氣產生量作為水蒸氣產生體120整體，較佳為1 mg/cm2
・10 min以上且20 mg/cm2
・10 min以下，更佳為1.5 mg/cm2
・10 min以上且18 mg/cm2
・10 min以下，進而較佳為5 mg/cm2
・10 min以上且15 mg/cm2
・10 min以下，進而較佳為7 mg/cm2
・10 min以上且15 mg/cm2
・10 min以下，進而更佳為9 mg/cm2
・10 min以上且15 mg/cm2
・10 min以下。 [水蒸氣產生量測定法] 此處，水蒸氣產生體120或蒸氣溫熱面罩100之水蒸氣產生量係使用圖11所示之裝置30，以如下方式測定之數值。圖11所示之裝置30包含鋁製測定室(容積2.1 L)31、使除濕空氣(濕度未達2%，流量2.1 L/分鐘)流入測定室31之下部之流入路32、使空氣自測定室31之上部流出之流出路33、設置於流入路32之入口溫濕度計34與入口流量計35、設置於流出路33之出口溫濕度計36與出口流量計37、及設置於測定室31內之溫度計(熱敏電阻)38。作為溫度計38，使用溫度解析力為0.01℃左右者。 水蒸氣產生體120或蒸氣溫熱面罩100之位於肌膚側之面之表面溫度之測定係於測定環境溫度30℃(30±1℃)下，將水蒸氣產生體120自氧氣遮斷袋取出，使水蒸氣產生體120或蒸氣溫熱面罩100之位於肌膚側之面、即水蒸氣釋放面向上而載置於測定室31，將裝有金屬球(4.5 g)之溫度計38放置於其上而進行測量。又，於該狀態下，自下部流入除濕空氣，根據由入口溫濕度計34與出口溫濕度計36所測量之溫度及濕度，求出空氣流入測定室31前後之絕對濕度之差，進而，根據由入口流量計35與出口流量計37所測量之流量，計算出水蒸氣產生體120或蒸氣溫熱面罩100所釋放之水蒸氣量。再者，本說明書中之水蒸氣產生量係指以將水蒸氣產生體120自氧氣遮斷袋取出之時點為起點至10分鐘後測定之總量。 又，自對面罩配戴者賦予適度之蒸氣感之觀點而言，本實施形態之蒸氣溫熱面罩100之水蒸氣產生量較佳為60 mg/10 min以上，更佳為100 mg/10 min以上，進而較佳為300 mg/10 min以上，進而較佳為500 mg/10 min以上，進而更佳為600 mg/10 min以上。 又，自抑止面罩中之結露之觀點而言，本實施形態之蒸氣溫熱面罩100之水蒸氣產生量較佳為2000 mg/10 min以下，更佳為1400 mg/10 min以下，進而較佳為1000 mg/10 min以下。 又，本實施形態之蒸氣溫熱面罩100之水蒸氣產生量較佳為60 mg/10 min以上且2000 mg/10 min以下，更佳為100 mg/10 min以上且1400 mg/10 min以下，進而較佳為300 mg/10 min以上且1000 mg/10 min以下，進而較佳為500 mg/10 min以上且1000 mg/10 min以下，進而更佳為600 mg/10 min以上且1000 mg/10 min以下。 繼而，對蒸氣溫熱面罩100所產生之效果進行說明。 蒸氣溫熱面罩100係將上述面罩110與水蒸氣產生體120組合而成者，水蒸氣產生體120之位於配戴者側之面係藉由具有7000秒/100 ml以下之透氣度之片材覆蓋，且於水蒸氣產生體120之與位於配戴者側之面為相反側之面上配置有具有超過8000秒/100 ml之透氣度之片材。 即，藉由將第1片材122A之透氣度設為7000秒/100 ml以下，且將第2片材122B之透氣度設為超過8000秒/100 ml，可抑制藉由水蒸氣產生部121產生之水蒸氣洩漏至面罩110之外部，而可對面罩110內部、即配戴者側賦予水蒸氣。 而且，藉由相對於面罩本體部101之配戴者側之面整體之面積，將水蒸氣產生體120所占面積之比率設定為30%以上且80%以下，而可不對配戴者造成悶氣地提高面罩110內部之絕對濕度。 藉由該等效果之協同效應，而可使人輕鬆地呼吸，可於面罩內積極地產生經加溫之水蒸氣，提高面罩內之絕對濕度，從而可提昇加溫加濕所產生之舒適感與喉或鼻之黏膜之潤濕感。又，藉由此種效果，減少因鼻塞等造成之不快感，藉此獲得使呼吸輕鬆，提高黏膜纖毛輸送功能，促進異物排出功能之效果。 蒸氣溫熱面罩100例如係以如下方式使用。 即，於面罩110與水蒸氣產生體120分離之情形時，蒸氣溫熱面罩100係開封氧氣遮斷袋取出水蒸氣產生體120，將其固定於面罩110之特定位置。面罩110係將各掛耳部102掛於配戴者之耳，將面罩本體部101以覆蓋配戴者之口與鼻之方式配戴。 又，於將水蒸氣產生體120封入於面罩110中之收容體104之情形時，通常，作為蒸氣溫熱面罩100整體封入氧氣遮斷袋中。作為該情形時之使用方法，開封該氧氣遮斷袋後，取出蒸氣溫熱面罩100，將各掛耳部102掛於配戴者之耳，將面罩本體部101以覆蓋配戴者之口與鼻之方式配戴。 水蒸氣產生體120與空氣中之氧氣反應而發熱並且產生水蒸氣。然後，面罩110內產生之水蒸氣自配戴者之口與鼻被吸入，可緩和低溫低濕環境所造成之咽喉、鼻之乾燥感，減少鼻塞等所造成之不快感，獲得放鬆效果，使人感到舒適。又，亦引發入睡感。進而，由於鼻腔之黏膜被加溫加濕，因此異物排出功能提高，可期待預防感冒等之效果。 又，唇部分由於角質層較薄，因此對溫度敏感，容易因水蒸氣產生體120之發熱接觸到唇部分而過於敏感地感覺到熱，針對於此，藉由對鼻之兩側部分進行加溫而可抑制該問題。 於本實施形態中，自為配戴者帶來舒適之蒸氣之觀點而言，蒸氣溫熱面罩100使用中之面罩內之絕對濕度之最大值較佳為12 g/m3
以上，更佳為13 g/m3
以上，進而較佳為15 g/m3
以上，進而較佳為20 g/m3
以上，進而更佳為25 g/m3
以上。 又，自防止面罩內之結露之觀點而言，蒸氣溫熱面罩100使用中之面罩內之絕對濕度之最大值較佳為50 g/m3
以下，更佳為45 g/m3
以下，進而較佳為40 g/m3
以下，進而更佳為35 g/m3
以下。 又，蒸氣溫熱面罩100使用中之面罩內之絕對濕度之最大值較佳為12 g/m3
以上且50 g/m3
以下，更佳為13 g/m3
以上且45 g/m3
以下，進而較佳為15 g/m3
以上且40 g/m3
以下，進而較佳為20 g/m3
以上且35 g/m3
以下，進而更佳為25 g/m3
以上且35 g/m3
以下。 又，於本實施形態中，自為配戴者帶來舒適之蒸氣之觀點而言，蒸氣溫熱面罩100使用中之面罩內之絕對濕度之平均值較佳為11.7 g/m3
以上，更佳為12 g/m3
以上，進而較佳為13 g/m3
以上，進而較佳為15 g/m3
以上，進而更佳為19 g/m3
以上。 又，自防止面罩內之結露之觀點而言，蒸氣溫熱面罩100使用中之面罩內之絕對濕度之平均值較佳為35 g/m3
以下，更佳為30 g/m3
以下，進而較佳為25 g/m3
以下。 又，自為配戴者帶來舒適之蒸氣之觀點而言，蒸氣溫熱面罩100使用中之面罩內之絕對濕度之平均值較佳為11.7 g/m3
以上且35 g/m3
以下，更佳為12 g/m3
以上且30 g/m3
以下，進而較佳為13 g/m3
以上且25 g/m3
以下，進而較佳為15 g/m3
以上且25 g/m3
以下，進而更佳為19 g/m3
以上且25 g/m3
以下。 再者，蒸氣溫熱面罩100使用時之絕對濕度可以如下方式測定。 [絕對濕度測定條件] 於20℃60%RH之環境下，於使用DIGITAL HUMAN TECHNOLOGY股份有限公司之男性人頭資料(52名日本人成年男性平均)製作之人體頭部模型之鼻下部安裝溫濕度感測器(Sensirion公司製造之SHT71)，自頭部模型之鼻部使用通風機(HARVARD APPARATUS DUAL PHASE CONTROL RESPIRATOR(HARVARD APPARATUS公司製造))，模擬人之呼吸節奏，以1分鐘15次、每次500 ml之頻度進行吸氣。於該狀態下，將蒸氣溫熱面罩100安裝於人體模型，測量溫濕度變化並記錄。作為記錄計，例如使用Sensirion公司製造之EK-H4等。根據溫度與相對濕度，計算出絕對濕度，求出10分鐘之最大絕對濕度與平均絕對濕度。 (第2實施形態) 於第1實施形態中，對第1片材之透氣度為7000秒/100 ml以下，且第2片材之透氣度超過8000秒/100 ml之例進行了說明，於第2實施形態中，將該等第1片材與第2片材之透氣度設為以下構成。 即，於本實施形態中，第2片材之透氣度為250秒/100 ml以上且8000秒/100 ml以下，且第1片材之透氣度相對於第2片材之透氣度為20%以下。 以下，對本實施形態進行說明。 再者，適當省略對與第1實施形態相同之構成、效果之說明。 於本實施形態中，第2片材122B可一部分為具有透氣性之透氣性片材，亦可一部分為不具有透氣性之不透氣性片材，但作為整體，採用250秒/100 ml以上且8000秒/100 ml以下之條件作為該第2片材122B之透氣度。 自防止水蒸氣產生體之異常發熱之觀點、及適當地分配自水蒸氣產生部121產生之水蒸氣而使水蒸氣充分應用於配戴者側之觀點而言，第2片材122B之透氣度較佳為4000秒/100 ml以上且7500秒/100 ml以下，更佳為5000秒/100 ml以上且7000秒/100 ml以下。 第2片材122B只要滿足上述之透氣度，則亦可視用途為一層或多層之合成樹脂製膜、或於該一層或多層之合成樹脂製膜之外表面層壓以選自針刺不織布、熱風不織布、及紡黏不織布之1種或2種以上之不織布為代表之各種纖維片材，而提高第2片材122B之質感。具體而言，使用包含聚乙烯膜及聚對苯二甲酸乙二酯膜之2層膜、包含聚乙烯膜及不織布之層壓膜、包含聚乙烯膜及紙漿片材之層壓膜等，特佳為包含聚乙烯膜及紙漿片材之層壓膜。 於本實施形態中，水蒸氣產生體120之位於配戴者側之面之第1片材122A之透氣度為該第2片材122B之透氣度之20%以下。 自適當地分配自水蒸氣產生部121產生之水蒸氣而使水蒸氣充分應用於配戴者側之觀點、及抑制水蒸氣產生體之膨脹而防止蒸氣溫熱面罩配戴時之悶氣之觀點而言，第1片材122A之透氣度較佳為第2片材122B之透氣度之10%以下，更佳為5%以下，進而較佳為3%以下，進而較佳為1%以下，進而更佳為0%。 第1片材122A之透氣度可自滿足為該第2片材122B之透氣度之20%以下之條件者中適當選擇，自適當地分配自水蒸氣產生部121產生之水蒸氣而使水蒸氣充分應用於配戴者側之觀點、及抑制水蒸氣產生體之膨脹而防止蒸氣溫熱面罩配戴時之悶氣之觀點而言，更具體而言，較佳為1600秒/100 ml以下，更佳為1000秒/100 ml以下，進而較佳為250秒/100 ml以下，進而較佳為10秒/100 ml以下，進而較佳為5秒/100 ml以下，進而更佳為0秒/100 ml。 作為具有此種透氣度之第1片材122A，例如較佳為使用雖具有透濕性但不具有透水性之合成樹脂製多孔性片材。具體而言，可使用使聚乙烯含有碳酸鈣等並進行延伸而成之膜。於該多孔性片材之情形時，亦可於多孔性片材之外表面層壓選自針刺不織布、熱風不織布、及紡黏不織布之1種或2種以上之不織布等各種纖維片材，而提高第1片材122A之質感。 又，第1片材122A只要滿足上述之透氣度，則其一部分亦可為不具有透氣性之不透氣性片材。 繼而，對本實施形態之蒸氣溫熱面罩100所產生之效果進行說明。 即，本實施形態之蒸氣溫熱面罩100係將第2片材122B之透氣度設為8000秒/100 ml以下，且將第1片材122A之透氣度設為第2片材122B之透氣度之20%以下，藉此可抑制藉由水蒸氣產生部121產生之水蒸氣洩露至面罩110之外部，而對面罩110內部、即配戴者側賦予水蒸氣。 而且，藉由相對於面罩本體部101之配戴者側之面整體之面積，將水蒸氣產生體120所占面積之比率設定為30%以上且80%以下，而可不對配戴者造成悶氣地提高面罩110內部之絕對濕度。 藉由該等效果之協同效應，而可使人輕鬆地呼吸，可於面罩內積極地產生經加溫之水蒸氣而提高面罩內之絕對濕度，從而可提昇加溫加濕所產生之舒適感與喉或鼻之黏膜之潤濕感。又，藉由此種效果，減少因鼻塞等造成之不快感，藉此獲得使呼吸輕鬆，提高黏膜纖毛輸送功能，促進異物排出功能之效果。 (第3實施形態) 於第1實施形態中，對使用收容體104作為固定機構之例進行了說明，於第3實施形態中，對使用黏著劑作為固定機構之例進行說明。以下，適當省略對與第1實施形態或第2實施形態相同之構成、效果之說明。 圖7係於第3實施形態中之面罩安裝水蒸氣產生體前之自配戴者側之面觀察之局部俯視圖。圖8係自上表面(配戴者之眼側)觀察第3實施形態中之面罩之一部分之剖視圖。 [面罩] 面罩本體部101可使用與上述第1實施形態或第2實施形態相同之素材。 於本實施形態中，如圖7所示，較佳為於面罩本體部101之配戴者側之面，以表明貼附水蒸氣產生體120之位置之方式形成有標記區域105。如圖8所示，於標記區域105上，經由黏著劑106而將水蒸氣產生體120固定於面罩本體部101。標記區域105可藉由印刷而改變區域內之顏色，亦可實施壓紋加工。又，標記區域105亦可為於周圍設置實線、虛線等線而成者。 又，自提高配戴感之觀點而言，亦可於水蒸氣產生體120之第1片材122A與配戴者之間，配置作為質感良好之片材材料之熱風不織布等不織布(未圖示)。於該情形時，較佳為不織布具有不妨礙水蒸氣之通過之程度之透氣性。又，進而更佳為具有撥水性，而使不織布不會因被水蒸氣沾濕而阻礙水蒸氣通過或阻礙空氣流入。 此種不織布可為形成於水蒸氣產生體120之第1片材122A上者，亦可為開閉自如地安裝於面罩110之配戴者側之面而於貼附水蒸氣產生體120後閉合者。 [黏著劑] 於本實施形態中，於水蒸氣產生體120之與配戴者側為相反之面、即第2片材122B之與配戴者側為相反之面設置有黏著劑106。藉此，可將水蒸氣產生體120穩定地固定於面罩110。 黏著劑106至少可將水蒸氣產生體120固定於面罩本體部101即可，大小、形狀並無特別限定。 作為黏著劑106，較佳為使用熱熔黏著劑。熱熔黏著劑通常含有黏著基劑、黏著賦予樹脂及軟化劑作為構成成分。作為熱熔黏著劑之種類，例如包含合成橡膠系、聚烯烴系(Polyethylene(PE，聚乙烯)系、Ethylene Vinyl Acetate(EVA，乙烯乙酸乙烯酯)系、Ethylene-Ethyl-Acrylate(EEA，乙烯-丙烯酸乙酯共聚物)系、Atactic Polypropylene(APP，無規聚丙烯)系、Amorphous PolyAlpha Olefin(APAO，非晶α-烯烴共聚物)系等)、聚醯胺系(尼龍系、聚醯胺系等)、聚酯系、丙烯酸系等。該等可單獨使用或組合二種以上使用。尤其，自保存性、黏著力、安全性等方面而言，較佳為合成橡膠系、聚烯烴系、丙烯酸系、醯胺系，尤其較佳為合成橡膠系。 黏著劑106於蒸氣溫熱面罩100之使用前之狀態下藉由剝離紙保護並且不附著於外部。剝離紙可並無特別限定地使用。 再者，亦可於面罩本體部101之配戴者側之面設置有黏著劑。具體而言，於面罩本體部101之摺疊線103附近及面罩本體部101之上端部附近，左右對稱地設置有一對。藉此，容易表明水蒸氣產生體120之固定位置。於該情形時，較佳為可重複使用之黏著劑。 以上，參照圖式對本發明之實施形態進行了敍述，該等為本發明之例示，亦可採用上述以外之各種構成。 例如，於上述各實施形態中，對水蒸氣產生體120係於面罩110分開貼附有2個之例進行了說明，亦可為2個水蒸氣產生體120藉由一個袋體相連之結構。 又，於上述各實施形態中，對面罩本體部101係由一片片材形成，且以摺疊線103呈左右對稱地摺疊之例進行了說明，面罩本體部101亦可為藉由重合相同形狀之兩片片材，且將一邊貼合而形成摺疊線103者。於該情形時所使用之片材可使用與上述各實施形態所說明者相同者。 關於上述實施形態，本發明進而揭示以下之組合物、製造方法、或用途。 ＜1＞ 一種蒸氣溫熱面罩，其具備： 面罩，其具備於配戴時覆蓋配戴者之鼻及口之面罩本體部、及設置於上述面罩本體部之左右兩端之一對掛耳部；及 水蒸氣產生體，其位於上述面罩本體部；且 相對於上述面罩本體部之上述配戴者側之面整體之面積，上述水蒸氣產生體所占面積之比率為30%以上且80%以下， 上述水蒸氣產生體係於內部收容水蒸氣產生部者， 上述水蒸氣產生體於上述水蒸氣產生部之上述配戴者側之面具備第1片材，且於上述水蒸氣產生部之與配戴者側之上述面為相反側之面具備第2片材， 上述第1片材之透氣度為7000秒/100 ml以下， 上述第2片材之透氣度超過8000秒/100 ml。 ＜2＞ 一種蒸氣溫熱面罩，其具備： 面罩，其具備於配戴時覆蓋配戴者之鼻及口之面罩本體部、及設置於上述面罩本體部之左右兩端之一對掛耳部；及 水蒸氣產生體，其位於上述面罩本體部；且 相對於上述面罩本體部之上述配戴者側之面整體之面積，上述水蒸氣產生體所占面積之比率為30%以上且80%以下， 上述水蒸氣產生體係於內部收容水蒸氣產生部者， 上述水蒸氣產生體於上述水蒸氣產生部之上述配戴者側之面具備第1片材，且於上述水蒸氣產生部之與配戴者側之上述面為相反側之面具備第2片材， 上述第2片材之透氣度為250秒/100 ml以上且8000秒/100 ml以下， 上述第1片材之透氣度相對於上述第2片材之透氣度為20%以下。 ＜3＞ 如＜1＞或＜2＞所記載之蒸氣溫熱面罩，其中上述水蒸氣產生體之垂直方向之剛性值較佳為30 gf/60 mm寬以上，更佳為60 gf/60 mm寬以上，進而較佳為70 gf/60 mm寬以上。 ＜4＞ 如＜1＞至＜3＞中任一項所記載之蒸氣溫熱面罩，其中上述水蒸氣產生體之垂直方向之剛性值較佳為150 gf/60 mm寬以下，更佳為130 gf/60 mm寬以下，進而較佳為120 gf/60 mm寬以下。 ＜5＞ 如＜1＞至＜4＞中任一項所記載之蒸氣溫熱面罩，其中上述蒸氣溫熱面罩之使用中之面罩內之絕對濕度之最大值較佳為12 g/m3
以上，更佳為13 g/m3
以上，進而較佳為15 g/m3
以上，進而較佳為20 g/m3
以上，進而更佳為25 g/m3
以上。 ＜6＞ 如＜1＞至＜5＞中任一項所記載之蒸氣溫熱面罩，其中上述蒸氣溫熱面罩之使用中之面罩內之絕對濕度之最大值較佳為50 g/m3
以下，更佳為45 g/m3
以下，進而較佳為40 g/m3
以下，進而更佳為35 g/m3
以下。 ＜7＞ 如＜1＞至＜6＞中任一項所記載之蒸氣溫熱面罩，其中上述面罩本體部之透氣阻力較佳為5 Pa以上，更佳為20 Pa以上，進而較佳為50 Pa以上。 ＜8＞ 如＜1＞至＜7＞中任一項所記載之蒸氣溫熱面罩，其中上述面罩本體部之透氣阻力較佳為200 Pa以下，更佳為190 Pa以下，進而較佳為180 Pa以下。 ＜9＞ 如＜1＞至＜8＞中任一項所記載之蒸氣溫熱面罩，其中上述面罩本體部之基重較佳為5 g/m2
以上，更佳為10 g/m2
以上，進而較佳為30 g/m2
以上。 ＜10＞ 如＜1＞至＜9＞中任一項所記載之蒸氣溫熱面罩，其中上述面罩本體部之基重較佳為200 g/m2
以下，更佳為150 g/m2
以下，進而較佳為120 g/m2
以下。 ＜11＞ 如＜1＞至＜10＞中任一項所記載之蒸氣溫熱面罩，其中上述水蒸氣產生部包含被氧化性金屬、吸水劑、水、及電解質。 ＜12＞ 如＜11＞所記載之蒸氣溫熱面罩，其中上述吸水劑之含量相對於上述被氧化性金屬100質量份，較佳為0.3質量份以上，更佳為1質量份以上，進而較佳為3質量份以上。 ＜13＞ 如＜11＞或＜12＞所記載之蒸氣溫熱面罩，其中上述吸水劑之含量相對於上述被氧化性金屬100質量份，較佳為100質量份以下，更佳為80質量份以下，進而較佳為60質量份以下。 ＜14＞ 如＜11＞至＜13＞中任一項所記載之蒸氣溫熱面罩，其中上述水蒸氣產生部之水分量相對於上述被氧化性金屬100質量份，較佳為35質量份以上，更佳為40質量份以上，進而較佳為50質量份以上。 ＜15＞ 如＜11＞至＜14＞中任一項所記載之蒸氣溫熱面罩，其中上述水蒸氣產生部之水分量相對於被氧化性金屬100質量份，較佳為200質量份以下，更佳為150質量份以下，進而較佳為100質量份以下，進而更佳為80質量份以下。 ＜16＞ 如＜1＞至＜15＞中任一項所記載之蒸氣溫熱面罩，其中上述水蒸氣產生體之水蒸氣產生量作為水蒸氣產生體整體，較佳為30 mg/單元・10 min以上，更佳為50 mg/單元・10 min以上，進而較佳為150 mg/單元・10 min以上，進而較佳為250 mg/單元・10 min以上，進而更佳為300 mg/單元・10 min以上。 ＜17＞ 如＜1＞至＜16＞中任一項所記載之蒸氣溫熱面罩，其中上述水蒸氣產生體之水蒸氣產生量作為水蒸氣產生體整體，較佳為1200 mg/單元・10 min以下，更佳為1000 mg/單元・10 min以下，進而較佳為800 mg/單元・10 min以下，進而較佳為700 mg/單元・10 min以下，進而更佳為500 mg/單元・10 min以下。 ＜18＞ 如＜1＞至＜17＞中任一項所記載之蒸氣溫熱面罩，其中上述水蒸氣產生體之每單位面積之水蒸氣產生量作為水蒸氣產生體整體，較佳為1 mg/cm2
・10 min以上，更佳為1.5 mg/cm2
・10 min以上，進而較佳為5 mg/cm2
・10 min以上，進而較佳為7 mg/cm2
・10 min以上，進而更佳為9 mg/cm2
・10 min以上。 ＜19＞ 如＜1＞至＜18＞中任一項所記載之蒸氣溫熱面罩，其中上述水蒸氣產生體之每單位面積之水蒸氣產生量作為水蒸氣產生體整體，較佳為20 mg/cm2
・10 min以下，更佳為18 mg/cm2
・10 min以下，進而較佳為15 mg/cm2
・10 min以下。 ＜20＞ 如＜1＞至＜19＞中任一項所記載之蒸氣溫熱面罩，其中上述蒸氣溫熱面罩之水蒸氣產生量較佳為60 mg/10 min以上，更佳為100 mg/10 min以上，進而較佳為300 mg/10 min以上，進而較佳為500 mg/10 min以上，進而更佳為600 mg/10 min以上。 ＜21＞ 如＜1＞至＜20＞中任一項所記載之蒸氣溫熱面罩，其中上述蒸氣溫熱面罩之水蒸氣產生量較佳為2000 mg/10 min以下，更佳為1400 mg/10 min以下，進而較佳為1000 mg/10 min以下。 ＜22＞ 如＜1＞至＜21＞中任一項所記載之蒸氣溫熱面罩，其中上述蒸氣溫熱面罩之使用中之面罩內之絕對濕度之平均值較佳為11.7 g/m3
以上，更佳為12 g/m3
以上，進而較佳為13 g/m3
以上，進而較佳為15 g/m3
以上，進而更佳為19 g/m3
以上。 ＜23＞ 如＜1＞至＜22＞中任一項所記載之蒸氣溫熱面罩，其中上述蒸氣溫熱面罩之使用中之面罩內之絕對濕度之平均值較佳為35 g/m3
以下，更佳為30 g/m3
以下，進而較佳為25 g/m3
以下。 [實施例] 藉由以下實施例，對本發明之實施形態進一步進行具體說明。實施例係用於說明者，並不限定本發明之範圍。 [實施例A] (實施例A1) 製作與第1實施形態所說明者相同之蒸氣溫熱面罩100。具體如下所述。 ＜水蒸氣產生部121之製作＞ 按以下步驟製備表1所示之組成之發熱組合物。 將增黏劑溶解於水中，繼而，溶解磷酸三鉀而準備水溶液。另一方面，準備將鐵粉、活性碳預混合而成之粉體，於上述水溶液中放入預混合粉體，藉由圓盤渦輪型攪拌翼，以150 rpm攪拌10分鐘，獲得漿狀之發熱組合物。 然後，於基材層121B之單面，使用模嘴塗佈法，以每個水蒸氣產生部121(4.9 cm×4.9 cm；面積24.0 cm2
)成為1.4 g之方式塗佈所得之發熱組合物。進而，於塗佈面上，以每個水蒸氣產生部121(同上)成為0.07 g之方式散佈食鹽(藥典氯化鈉(大塚製藥公司製造))而形成水蒸氣產生層121A，於其上重疊保水片材121C而製作水蒸氣產生部121。 作為基材層121B，使用基重27 g/m2
之聚乙烯膜。作為保水片材121C，使用將木漿製紙(秤量20 g/m2
，伊野紙股份有限公司製造)、吸水性聚合物(聚丙烯酸鈉，球狀，平均粒徑300 μm，秤量50 g/m2
，Aqualic CA，日本觸媒股份有限公司製造)、及木漿製紙(基重30 g/m2
，伊野紙股份有限公司製造)積層並一體化而成之聚合物片材。 將以此種方式獲得之水蒸氣產生部121以保水片材121C配置於肌膚側(第1片材122A側)之方式重疊2層(質量3.43 g)。剛製作後之水蒸氣產生部121中之水分量相對於鐵粉100質量份為62質量份。 [表1]
＜水蒸氣產生體120之製作＞ 藉由包含表3中記載之透氣度之第1片材122A、及第2片材122B之袋體122被覆所得之水蒸氣產生部121整體，製作水蒸氣產生體120。具體而言，作為水蒸氣產生體120之第1片材122A(以下相同)，設為積層2層TMS不織布(熱黏合(PET/PE)-熔噴(聚丙烯)-紡黏(聚丙烯)積層一體型，基重50 g/m2
，Kuraray股份有限公司製造)，透氣度0秒/100 ml之片材。作為水蒸氣產生體120之第2片材122B(以下相同)，設為將聚乙烯100質量%之膜與紙漿片材層壓而成之基重40 g/m2
之不透氣性片材。 於第1片材122A與第2片材122B之間配置水蒸氣產生部121，將周緣部密閉密封，獲得水蒸氣產生體120。此時，水蒸氣產生部121之基材層121B係配置於第2片材122B側。此時，包含透氣面與密封部之第1片材122A之面積為39.7 cm2
(6.3 cm×6.3 cm)。 水蒸氣產生體120於實施下述評價前係放入氧氣遮斷袋中保存。 ＜蒸氣溫熱面罩100之製作＞ 作為構成面罩110之面罩本體部101之片材，以SMS不織布(紡黏(聚丙烯)-熔噴(聚丙烯)-紡黏(聚丙烯)積層一體型，基重50 g/m2
)成為外側，基重25g之紡黏不織布(聚丙烯)成為內側(配戴者側)之方式重疊2層。此時之面罩本體部101之0.3 μm以上粒子之遮斷率為25%。隔著面罩本體部101之縱中心之摺疊線103而於兩側之上方，將收容體104之面罩上部以外熱熔，各製作1個(計2個)收容水蒸氣產生體120之收容體104。於面罩本體部101之端部安裝具有伸縮性之橡皮繩狀之掛耳部102，製作成為立體形狀之面罩110。於收容體部分測量面罩本體部101之透氣阻力，結果為148 Pa/30 mmΦ・壓差。再者，於下述評價中，自面罩本體部101之2片不織布未被熱熔之面罩110之上側，於收容體104中各放入1個(計2個)水蒸氣產生體120，於面罩本體部101之摺疊線103附近及面罩本體部101之上端部附近(鼻側)，左右對稱地安裝一對水蒸氣產生體120，設為蒸氣溫熱面罩100。 於本實施例中，面罩本體部101之配戴者側之面整體之面積係藉由以下之方法計算。 將面罩本體部101於中央部縱向摺疊，將自連結上下最分開之點之線(A線)垂直地向前端部方向最遠離之摺疊線上之點且密封部之掛耳側端部設為面罩前端，沿自通過該面罩前端之與上述A線平行之線(B線)向掛耳方向平行離開7 cm之線(C線)進行切取，進而，切取密封部。對所切取之面罩本體之單面，將外周複寫於A4紙(TOPPAN FORMS公司製造，recycle cut規格G80A4W，基重64 g/m2
，21.0 cm×29.7 cm：面積623.7 cm2
)，以剪刀切取該外周部，測量所切取之紙之質量。根據A4紙之總質量與切取之紙之質量之2倍量、及A4紙之總面積換算，結果為面罩本體部101之配戴者側之面整體之面積為152.0 cm2
，左右2個水蒸氣產生體120之面積相對於面罩本體部101之配戴者側之面整體之面積的比為52%。 (實施例A2及A3) 作為水蒸氣產生體120之第1片材122A，使用透氣度4.0秒/100 ml、基重40 g/m2
(商品名：Eleven MOA，TOKAI PULP公司製造)之合成紙漿紙，於實施例A2重疊1片該合成紙漿紙，於實施例A3中重疊2片。除此以外，以與實施例A1相同之方法製作蒸氣溫熱面罩100。 (實施例A4～A8) 作為水蒸氣產生體120之第1片材122A，使用具有表3記載之透氣度之基重50 g/m2
(商品名：TSF-EU，興人股份有限公司製造)之含碳酸鈣聚乙烯膜，除此以外，以與實施例A1相同之方法製作蒸氣溫熱面罩100。 (實施例A9～A11) 作為水蒸氣產生體120之第2片材122B，使用具有表3記載之透氣度之基重50 g/m2
(商品名：TSF-EU，興人股份有限公司製造)之含碳酸鈣聚乙烯膜，除此以外，以與實施例A1相同之方法製作蒸氣溫熱面罩100。 (實施例A12、A13及比較例A1) 使用將實施例A1之水蒸氣產生部121(4.9 cm×4.9 cm；面積24.0 cm2
)切斷為3.3 cm×3.3 cm(面積10.9 cm2
)之大小者作為水蒸氣產生部。又，於水蒸氣產生體之製作中，將第1片材與第2片材之大小，於實施例A12中設為4.8 cm×4.8 cm(面積23.0 cm2
)，於實施例A13中設為5.5 cm×5.5 cm(面積30.3 cm2
)，於比較例A1中設為3.9 cm×3.9 cm(面積15.2 cm2
)，於各個片材之間配置水蒸氣產生部121，將周緣部密閉密封，獲得水蒸氣產生體120。除此以外，以與實施例A1相同之方法製作蒸氣溫熱面罩100，藉此將水蒸氣產生體120之面積相對於面罩本體部101之配戴者側之面整體之面積的比設為表3所記載者。 (實施例A14、A15及比較例A2) 於水蒸氣產生部121之製作中，以如下方式進行製作：於將發熱組合物模嘴塗佈於基材層121B之單面時，將1個水蒸氣產生部121之大小，於實施例A14中設為4.9 cm×6.5 cm(面積31.9 cm2
)，於實施例A15中設為4.9 cm×7.5 cm(面積36.8 cm2
)，於比較例A2中設為4.9 cm×8.5 cm(面積41.7 cm2
)，且發熱組合物之塗佈量成為與實施例A1者相同厚度(換算為每4.9 cm×4.9 cm時為1.4 g)。又，於水蒸氣產生體之製作中，將第1片材與第2片材之大小，於實施例A14中設為6.3 cm×8.4 cm(面積52.9 cm2
)，於實施例A15中設為6.3 cm×9.6 cm(面積60.5 cm2
)，於比較例A2中設為6.4 cm×10.6 cm(面積67.8 cm2
)，於各個片材之間配置水蒸氣產生部121，將周緣部密閉密封，獲得水蒸氣產生體120。除此以外，以與實施例A1相同之方法製作蒸氣溫熱面罩100，藉此將水蒸氣產生體120之面積相對於面罩本體部101之配戴者側之面整體之面積的比設為表3所記載者。 (實施例A16及A17) 作為水蒸氣產生部，僅使用1層實施例A1所使用之水蒸氣產生部121，又，使用表3所示之透氣度之第1片材，除此以外，依照實施例A1製作水蒸氣產生體120。對於實施例A16，除此以外以與實施例A1相同之方法製作蒸氣溫熱面罩100，對於實施例A17，於製作蒸氣溫熱面罩時，除所製作之水蒸氣產生體以外，還以與水蒸氣產生體之第2片材相接之方式積層1片切取為63 mm見方之大小的ADVANTEC(註冊商標)定性濾紙No.2，製作蒸氣溫熱面罩100。 (實施例A18及A19) 作為水蒸氣產生部，以如下步驟製作表2所示之組成之粉體狀之發熱組合物。 於氮氣氣流下，將鐵粉、水、食鹽、吸水聚合物及活性碳混合至均勻，製作粉體狀之水蒸氣產生部。於水蒸氣產生體120之製作中，對於實施例A18，替換為實施例A1中之片狀之水蒸氣產生部121，對於實施例A19，替換為實施例A8中之片狀之水蒸氣產生部121，分別使用2.8 g上述粉體狀之水蒸氣產生部，除此以外，以與實施例A1相同之方法製作蒸氣溫熱面罩100。 [表2]
(比較例A3及A4) 作為水蒸氣產生體120之第1片材122A，使用基重50 g/m2
、TSF-EU、興人股份有限公司製造之含碳酸鈣聚乙烯膜，對於比較例A3，使用透氣度8000秒/100 ml之膜，對於比較例A4，使用透氣度10000秒/100 ml之膜，除此以外，以與實施例A1相同之方法製作蒸氣溫熱面罩100。 開封氧氣遮斷袋(包裝材)，取出所製作之水蒸氣產生體120，迅速安裝於面罩110，進行以下之評價。將結果表示於表3中。 [水蒸氣產生體之剛性值之測定] 使用Tensilon萬能試驗機(ORIENTEC RTC-1150A)，測定面罩組件之彎曲剛性值。切取面罩本體之摺疊線而使用面罩單側，於將1單元之水蒸氣產生體插入面罩收容體中之狀態下測量彎曲剛性值。測定條件為以跨距間距離30 mm支持水蒸氣產生體，藉由寬度60 mm、前端半徑5 mm之板狀之按壓構件，對試驗片(水蒸氣產生體)之中央部以十字頭速度20 mm/min施加負荷。將此時之峰值荷重(3次測量之平均值)設為剛性值。 [水蒸氣產生量之測定(水蒸氣產生體)] 準備內容積為4.2升、內部之濕度為1 RH%以下，可對密閉系統內供給2.1升/min之乾燥空氣之試驗機，於其內部，以使水蒸氣可進行蒸散之方式靜置特定尺寸之水蒸氣產生體120並使其發熱。然後，以濕度計測定排出至上述密閉系統外之空氣之濕度，使用下述式(1)求出發熱開始後產生之水蒸氣之量，設為每單位時間之水蒸氣量。e為水蒸氣壓(Pa)，es為飽和水蒸氣壓(Pa：引用自JIS Z8806)，T為溫度(℃：乾球溫度)，s為取樣週期(秒)。 相對濕度U(%RH)＝(e/es)×100 絕對濕度D(g/m3
)＝(0.794×10-2
×e)/(1＋0.00366T) ＝(0.794×10-2
×U×es)/[100×(1＋0.00366T)] 單位空氣容積P(升)＝(2.1×s)/60 每單位時間之水蒸氣之產生量A(g)＝(P×D)/1000・・・(1) [水蒸氣發熱體之膨脹] 於20℃60%RH之環境下，於使用DIGITAL HUMAN TECHNOLOGY股份有限公司之男性人頭資料(52名日本人成年男性平均)製作之人體頭部模型(以下稱「人體模型」)配戴面罩30分後，自面罩本體取出水蒸氣產生體，以注射器抽吸水蒸氣產生體內部(以肌膚側片材及外側片材封閉之內部)之氣體，測定體積。進行2次測定，取其平均值設為測定值。 [水蒸氣產生量之測定(蒸氣溫熱面罩)] 藉由對水蒸氣產生體進行之上述之水蒸氣產生量之測定方法，進行水蒸氣產生量之測定。 [面罩本體部101之透氣阻力之測定] 面罩本體部101之透氣阻力係使用面罩測試機MTS-2(柴田科學)進行測定。於面罩測試機MTS-2(柴田科學製)之本體上部，配置自面罩本體部101之片材材料切出為3.5 cm×3.5～5 cm×5 cm之尺寸之片材，藉由片材固定用治具無遺漏地固定。測定係以試驗面積7 cm2
(3 cmΦ)、試驗流量10 L/min.進行，測定進行10秒鐘。透氣阻力係根據對片材之空氣流入側(入口側)與空氣流出側(出口側)之差壓求出，結果為148 Pa。 [面罩內絕對濕度之測量] 於20℃60%RH之環境下，於人體模型之鼻下部，安裝溫濕度計(Sensirion公司製造之SHT75)，自頭部模型之鼻部使用通風機(HARVARD APPARATUS DUAL PHASE CONTROL RESPIRATOR(HARVARD APPARATUS公司製造))，模擬人之呼吸節奏，以1分鐘15次、每次500 ml之頻度進行吸氣。於該狀態下，將蒸氣溫熱面罩100配戴於人體模型，測量溫濕度變化。根據溫度與相對濕度，計算出絕對濕度，求出10分鐘之最大絕對濕度與平均絕對濕度。 [面罩配戴感評價(溫感、持續性、蒸氣感(濕潤感)、悶氣度)] 於22℃之環境下，使5名男性官能檢查員評價面罩之配戴感。對配戴面罩之狀態下之溫感、持續性、蒸氣感(濕潤感)及悶氣度，按照以下之基準進行評價，選擇人數最多之分數進行得分化。 溫感 1：與單獨面罩本體相比，難以感受到溫暖程度之差 2：與單獨面罩本體相比，較溫暖 3：與單獨面罩本體相比，明顯溫暖且為適度之溫感 4：與單獨面罩本體相比，明顯溫暖但稍熱 5：與單獨面罩本體相比，明顯溫暖但較熱 持續性 1：舒適之溫感及蒸氣感之持續時間未達5分鐘 2：舒適之溫感及蒸氣感之持續時間為5分鐘以上且未達10分鐘 3：舒適之溫感及蒸氣感之持續時間為10分鐘以上 蒸氣感(濕潤感) 1：與單獨面罩本體相比，於喉或鼻之黏膜難以感受到濕潤感之差 2：與單獨面罩本體相比，於喉或鼻之黏膜感受到略有濕潤感 3：與單獨面罩本體相比，於喉或鼻之黏膜感受到濕潤感 4：與單獨面罩本體相比，喉或鼻之黏膜之濕潤感優異 5：與單獨面罩本體相比，喉或鼻之黏膜之濕潤感非常優異 悶氣度 1：與面罩本體相比，非常悶氣 2：與面罩本體相比，較為悶氣 3：與面罩本體相比，略感悶氣 4：與面罩本體相比，幾乎未感到悶氣 5：與面罩本體相同，完全未感到悶氣 [表3]
[實施例B] (實施例B1) 製作與上述實施例A相同之形狀之蒸氣溫熱面罩100。具體如下所述。 ＜水蒸氣產生部121之製作＞ 使用表1所示之組成之發熱組合物，藉由與上述實施例A1相同之方法製作水蒸氣產生部121。 ＜水蒸氣產生體120之製作＞ 藉由包含表4所記載之透氣度之第1片材122A、及第2片材122B之袋體122被覆所得之水蒸氣產生部121整體，製作水蒸氣產生體120。具體而言，作為水蒸氣產生體120之第1片材122A(以下相同)，設為將TMS不織布(熱黏合(PET/PE)-熔噴(聚丙烯)-紡黏(聚丙烯)積層一體型，基重50 g/m2
，Kuraray股份有限公司製造)積層2層，且透氣度0秒/100 ml之片材。作為水蒸氣產生體120之第2片材122B(以下相同)，使用透氣度7000秒/100 ml、基重50 g/m2
(商品名：TSF-EU，興人股份有限公司製造)之含碳酸鈣聚乙烯膜。於第1片材122A與第2片材122B之間配置水蒸氣產生部121，將周緣部密閉密封，獲得水蒸氣產生體120。此時，水蒸氣產生部121之基材層121B係配置於第2片材122B側。此時，使透氣面(第1片材122A)之面積成為6.3 cm×6.3 cm(面積39.7 cm2
)(水蒸氣產生部121占透氣面之面積之面積率為60.5%)。 水蒸氣產生體120於實施下述評價前係裝入氧氣遮斷袋中保存。 ＜蒸氣溫熱面罩100之製作＞ 藉由與上述實施例A1相同之方法製作蒸氣溫熱面罩100。 (實施例B2及B3) 作為水蒸氣產生體120之第1片材122A，使用透氣度4.0秒/100 ml、基重40 g/m2
(商品名：Eleven MOA，TOKAI PULP公司製造)之合成紙漿紙，於實施例B2中，將該合成紙漿紙重疊1片，於實施例B3中重疊2片。除此以外，以與實施例B1相同之方法製作蒸氣溫熱面罩100。 (實施例B4) 作為水蒸氣產生體120之第1片材122A，使用透氣度250秒/100 ml、基重50 g/m2
(商品名：TSF-EU，興人股份有限公司製造)之含碳酸鈣聚乙烯膜。除此以外，以與實施例B1相同之方法製作蒸氣溫熱面罩100。 (實施例B5～B9) 作為水蒸氣產生體120之第2片材122B，使用具有表4所記載之透氣度之基重50 g/m2
(商品名：TSF-EU，興人股份有限公司製造)之含碳酸鈣聚乙烯膜，除此以外，以與實施例B1相同之方法製作蒸氣溫熱面罩100。 (實施例B10、B11及比較例B1) 使用將實施例B1之水蒸氣產生部121(4.9 cm×4.9 cm；面積24.0 cm2
)切斷為3.3 cm×3.3 cm(面積10.9 cm2
)之大小者作為水蒸氣產生部。又，於水蒸氣產生體之製作中，將第1片材與第2片材之大小，於實施例B10中設為4.8 cm×4.8 cm(面積23.0 cm2
)，於實施例B11中設為5.5 cm×5.5 cm(面積30.3 cm2
)，於比較例B1中設為3.9 cm×3.9 cm(面積15.2 cm2
)，於各個片材之間配置水蒸氣產生部121，將周緣部密閉密封，獲得水蒸氣產生體120。除此以外，以與實施例B1相同之方法製作蒸氣溫熱面罩100，藉此將水蒸氣產生體120之面積相對於面罩本體部101之配戴者側之面整體之面積的比設為表4所記載者。 (實施例B12、B13及比較例B2) 於水蒸氣產生部121之製作中，以如下方式進行製作：於基材層121B之單面模嘴塗佈發熱組合物時，將1個水蒸氣產生部121之大小，於實施例B12中設為4.9 cm×6.5 cm(面積31.9 cm2
)，於實施例B13中設為4.9 cm×7.5 cm(面積36.8 cm2
)，於比較例B2中設為4.9 cm×8.5 cm(面積41.7 cm2
)，且發熱組合物之塗佈量成為與實施例B1者相同厚度(換算為每4.9 cm×4.9 cm時為1.4 g)。又，於水蒸氣產生體之製作中，將第1片材與第2片材之大小，於實施例B12中設為6.3 cm×8.4 cm(面積52.9 cm2
)，於實施例B13中設為6.3 cm×9.6 cm(面積60.5 cm2
)，於比較例B2中設為6.4 cm×10.6 cm(面積67.8 cm2
)，於各個片材之間配置水蒸氣產生部121，將周緣部密閉密封，獲得水蒸氣產生體120。除此以外，以與實施例B1相同之方法製作蒸氣溫熱面罩100，藉此將水蒸氣產生體120之面積相對於面罩本體部101之配戴者側之面整體之面積的比設為表4所記載者。 (實施例B14及B15) 作為水蒸氣產生部，僅使用1層實施例B1所使用之水蒸氣產生部121，又，使用表4所示之透氣度之第1片材，除此以外，按照實施例B1製作水蒸氣產生體120。對於實施例B14，除此以外按照與實施例B1相同之方法製作蒸氣溫熱面罩100，對於實施例B15，於製作蒸氣溫熱面罩時，除所製作之水蒸氣產生體以外，還以與水蒸氣產生體之第2片材相接之方式積層1片切取為63 mm見方大小之ADVANTEC(註冊商標)定性濾紙No.2，製作蒸氣溫熱面罩100。 (實施例B16) 作為水蒸氣產生部，按以下步驟製作表2所示之組成之粉體狀之發熱組合物。 於氮氣氣流下，將鐵粉、水、食鹽、吸水聚合物及活性碳混合至均勻，製作粉體狀之水蒸氣產生部。於水蒸氣產生體120之製作中，替換為實施例B1中之片狀之水蒸氣產生部121，使用2.8 g上述粉體狀之水蒸氣產生部，除此以外，以與實施例B1相同之方法製作蒸氣溫熱面罩100。 (比較例B3及B4) 作為水蒸氣產生體120之第1片材122A及第2片材122B，使用表4所示之透氣度、基重50 g/m2
、TSF-EU、興人股份有限公司製造之含碳酸鈣聚乙烯膜，除此以外，以與實施例B1相同之方法製作蒸氣溫熱面罩100。 開封氧氣遮斷袋(包裝材)，取出所製作之水蒸氣產生體120，迅速安裝於面罩110，進行與實施例A相同之評價。將結果表示於表4中。 [表4] The inventors have made it easy for people to breathe, and actively generate warmed water vapor in the mask, so that people can inhale the air with an increased absolute humidity in the mask, thereby improving the mucous membrane of the throat or nose. The effect of this issue has been studied. The present inventors have studied the technology described in the aforementioned patent document and found that a mask having a heat generating function such as that of Patent Document 1 cannot raise the absolute humidity in the mask sufficiently because the purpose is to heat and not actively generate steam. Further, in Patent Document 2, it is described that the heating element generates water vapor, but the ratio of the area of the area where the heating element is provided to the area of the mask surface is low, and there is a tendency that a sufficient heating effect and water vapor generation effect cannot be obtained. . In addition, Patent Document 3 describes that water heating generates steam. However, it is designed in such a way that the air permeability of the sheet provided on the heating element on the side opposite to the wearer side is set high, and the oxygen is actively introduced into the air to the heating element to promote the oxidation reaction. The heat generating body is expanded by the generated water vapor. Therefore, the person who makes the mask close to the cheek or the nose with a soft touch to eliminate the gap is not the person who raises the absolute humidity inside the mask. Furthermore, Patent Document 4 describes a water vapor generator that supplies a large amount of water vapor to the skin, and also discloses a method for using the vapor mask as a steam mask. However, there is a tendency that the ratio of the area of the area where the heating element is provided to the area of the mask body portion is high, and the mask body portion has a high basis weight and low air permeability, so it is felt when worn for a long time. Sulking, there is room for improvement in this area. Therefore, it can be seen that the solution can make people breathe easily, and the heated water vapor is actively generated in the mask, so that the person can inhale the air with an increased absolute humidity in the mask, thereby improving the wetness of the mucous membranes of the throat or nose. As for the problem of the effects, there is room for improvement in the technologies disclosed in Patent Documents 1 to 4. The present inventors have studied the means for solving the above-mentioned problems, and found that it is possible to use a structure of a water vapor generating body using a specific sheet material structure by using an area ratio of the water vapor generating body to the mask body portion. Provided is a steam warming mask which allows people to breathe easily, and can actively generate heated water vapor in the mask to increase the absolute humidity in the mask, thereby improving the moisturizing feeling of the mucosa of the throat or nose. According to the present invention, there is provided a steam warming which can make people breathe easily, and can actively generate heated water vapor in the mask, increase the absolute humidity in the mask, and thereby increase the wetness of the mucosa of the throat or nose. Face mask. Hereinafter, embodiments of the present invention will be described using drawings. In all the drawings, the same constituent elements are denoted by the same reference numerals, and descriptions thereof are appropriately omitted. In addition, in this specification, unless otherwise stated, "-" means the above to the following. In addition, the components and elements described in each embodiment may be appropriately combined as long as the effects of the invention are not impaired. Moreover, in this embodiment, the air permeability of a sheet | seat etc. can be measured as follows. Air permeability is a value measured in accordance with JIS P8117 (2009 revision) and is defined as 100 ml of air passing through 6.42 cm at a fixed pressure 2 The time of the area. Therefore, a large value of the air permeability means that it takes a long time to pass air, that is, the air permeability is low. Conversely, a smaller air permeability value means higher air permeability. In this way, the magnitude of the air permeability value has an inverse relationship with the level of air permeability. Air permeability can be measured by Wang Yan type air permeability meter. In addition, in the present specification, those having an air permeability of 30,000 seconds / 100 ml or more are regarded as "difficult to breathe", and those having an air permeability of 80,000 seconds / 100 ml or more are regarded as "air-impermeable". (First Embodiment) The steam warming mask in this embodiment is shown below. A steam warming mask comprising: a mask having a mask body portion covering a nose and a mouth of a wearer when worn, and a pair of hanging ear portions provided at left and right ends of the mask body portion; and water The steam generating body is located in the mask main body portion; and the ratio of the area occupied by the steam generating body is 30% or more and 80% or less with respect to the entire area of the wearer-side surface of the mask main body portion. If the water vapor generating system contains a water vapor generating unit therein, the water vapor generating body includes a first sheet on a surface of the wearer side of the water vapor generating unit, and the water vapor generating unit and the wearer have a first sheet. The above-mentioned side on the side is provided with a second sheet on the opposite side. The air permeability of the first sheet is 7000 seconds / 100 ml or less, and the air permeability of the second sheet exceeds 8000 seconds / 100 ml. FIG. 1 is a perspective view showing an example of a steam warming mask 100. The steam warming mask 100 is a combination of a mask 110 and a water vapor generating body 120. FIG. 2 is a diagram showing an example of a use state of the steam warming mask 100. As shown in FIG. FIG. 3 is a plan view of a part of the mask 110 in the first embodiment as viewed from the surface of the wearer's side. 4 is a cross-sectional view of a part of the mask according to the first embodiment as viewed from the upper surface (the eye side of the wearer). Furthermore, in this embodiment, the steam warming mask 100 is described as the mask 110 separated from the water vapor generating body 120, and the water vapor generating body 120 can be placed in the container 104, but the steam warming mask 100 may be used. The water vapor generating body 120 is enclosed in the containing body 104 of the mask 110. [Mask] As shown in FIGS. 1 and 2, the mask 110 includes a mask body portion 101 that covers the nose and mouth when worn, and a pair of ear-mounting portions 102 provided on one of the left and right ends of the mask body portion 101. In the present embodiment, the mask 110 is shown as having a fold line 103 at a position corresponding to the nose bridge of the wearer. However, the mask 110 may be a flat shape without the fold line 103 depending on the application or the like. Hereinafter, the shape of the mask 110 will be described using an example having the folding line 103 as an example. In this embodiment, the mask body 101 is sheet-shaped, and more specifically, it is formed of a single sheet, and is folded symmetrically with respect to the folding line 103. Before use, the mask body 101 is folded into a flat shape by folds along the fold line 103. As shown in FIGS. 1 and 2, the folding line 103 has a substantially arc shape with the nose portion becoming a convex portion, and the upper portion and the lower portion are bonded together. The mask main body portion 101 is opened from the side opposite to the folding line 103 and is worn so that the inner side surface on which the sheet is overlapped becomes the wearer side surface. The fold line 103 protrudes toward the front of the mask body portion 101 when the mask 110 is worn. If there is a folding line 103, the upper part of the mask body 101 is closely adhered along the shape of the nose, so it is not easy to generate a gap, and the heating and humidifying effect can be improved, which is preferable from this aspect. One of the sheets forming the mask body 101 may be a single structure (ie, one ply), or may be a one-piece structure (ie, multiple layers) formed by laminating a plurality of sheets. By using a plurality of sheets, it is possible to impart individual functions to each sheet, and thereby various functions can be imparted to the covering portion, which is preferable in this respect. In the case where a plurality of sheets are used, each of the sheets may be in a laminated state in which the entire surfaces are joined to each other, or may be in a state of being separated from each other. In addition, in a state where the sheets are separated from each other, the joining of the sheets may seal the edges of the sheets along the shape of the covering portion, or a part of the edges may be joined only by spot sealing. In this embodiment, for example, as shown in FIG. 4, an example in which the mask body 101 has a single structure will be described. The material of the mask body 101 can be used in the technical field of masks from the previous users. The type of the mask body 101 is not particularly limited as long as it has a certain air permeability. For example, a fibrous sheet such as a non-woven fabric or gauze can be used. From the viewpoint of ease of processing or economical efficiency, a non-woven fabric is preferably used. As the fiber material of the non-woven fabric, for example, a polyester selected from PET (polyethylene terephthalate) and the like; polyolefins such as PE (polyethylene), PP (polypropylene), and ethylene-propylene copolymers;萦; one or two or more kinds of fiber, such as cotton. In addition, as the non-woven fabric, fibers using one or more of the above materials can be used, and hot air method, spunbond method, needle punch method, melt-blown method, carding method, hot-melt method, hydroentanglement method, and solvent bonding Law and so on. From the viewpoint of allowing water vapor generated from the water vapor generating body 120 to remain in the mask 110 and the viewpoint of making breathing easier, the mask body portion 101 preferably has a moderate ventilation resistance. Specifically, the ventilation resistance of the mask body 101 is preferably 5 Pa or more, more preferably 20 Pa or more, and even more preferably 50 Pa or more. The ventilation resistance of the mask body 101 is preferably 200 Pa or less, more preferably 190 Pa or less, and even more preferably 180 Pa or less. The ventilation resistance of the mask body 101 is preferably 5 Pa or more and 200 Pa or less, more preferably 20 Pa or more and 190 Pa or less, and even more preferably 50 Pa or more and 180 Pa or less. In addition, when the structure of the mask main body portion 101 is multi-layered, the air permeability resistance is measured in a state where a plurality of sheets are all overlapped. The ventilation resistance of the mask body 101 can be measured as follows. As shown in FIG. 10, a sheet obtained by cutting out a sheet of 3.5 to 5 cm square from the sheet material of the mask body portion 101 is arranged on the upper part of the breath resistance evaluation device body 70 of the mask tester MTS-2 (manufactured by Shibata Science Corporation). The material 101a is fixed without omission by the sheet fixing jig 71. The test area is 7 cm 2 (Inner diameter: 30 mm) and test flow rate of 10 L / min. For 10 seconds, and the ventilation resistance was obtained from the differential pressure between the air inflow side (inlet side) and the air outflow side (outlet side) to the sheet 101a. Regarding the basis weight of the mask main body portion 101, the basis weight is preferably 5 g / m from the viewpoint of preventing the inside of the see-through mask 110 or the viewpoint of well-balanced improvement in heat retention, flexibility, thickness, and sheet strength. 2 Above, more preferably 10 g / m 2 Above, and further preferably 30 g / m 2 Above, again, preferably 200 g / m 2 Below, more preferably 150 g / m 2 Below, more preferably 120 g / m 2 the following. The basis weight is preferably 5 g / m. 2 Above 200 g / m 2 Below, more preferably 10 g / m 2 Above 150 g / m 2 Below, more preferably 30 g / m 2 Above 120 g / m 2 the following. In this embodiment, the steam warming mask 100 includes a water vapor generating body 120. The water vapor generating body 120 may be incorporated into the mask body portion 101, or may be a fixing mechanism having a water vapor generating body 120 fixed on the mask body portion 101. The water vapor generating body 120 is fixed during use, and is used in the present invention. In the embodiment, it is fixed during use. In the embodiment shown in FIGS. 1 and 2, the mask body 101 is provided with a receiving body 104 on the face of the wearer's side by the sealing portion 107. The containing body 104 can freely hold the water vapor generating body 120. Thereby, after using the mask 110, the water vapor generating body 120 can be replaced with the former, and the mask 110 can be used repeatedly. As a method for forming the containing body 104, for example, as shown in FIG. 3, a sealing portion 107a may be formed, and the sealing portion 107a may surround the outer periphery of the two water vapor generating bodies 120 arranged in the lateral direction except the upper portion. Specifically, the following methods can be cited: the sheet constituting the containing body 104 is overlapped on the face of the wearer side of the mask body 101, and the sealing portion 107a shown in FIG. 3 is sealed by heat fusion or the like; or When the mask body portion 101 is manufactured, the sheets constituting the receiving body 104 are overlapped, the portion of the folding line 103 of the longitudinal center portion of the mask body portion 101 is sealed, and then the sealing portion 107a shown in FIG. 3 is sealed. Thereby, a bag-shaped receiving body 104 capable of inserting the water vapor generating body 120 from above the mask body 101 can be formed. Moreover, the method of forming the containing body 104 is not limited to this. 5 and 6 are plan views of a modification of the mask in the first embodiment as viewed from the surface of the wearer's side. That is, as shown in FIGS. 5 and 6, the containing body 104 can also be formed by the sealing portion 107 b and the sealing portion 107 c. The sealing portion 107 b and the sealing portion 107 c are located at a portion below the fixed water vapor generating body 120. A sheet constituting the mask body 101 and a sheet constituting the container 104 are fixed. In FIG. 5, a sealing portion 107 b is shown, which includes a straight line extending laterally along the central portion of the mask body portion 101 and extending so as to contact the lower portion of the water vapor generating body 120, and a hang along the water vapor generating body 120. A longitudinal straight line extending from a part of the lower part of the side surface of the ear part 102 side. In FIG. 6, there is shown a sealing portion 107 c which is a straight line that is deformed along a lateral direction slightly above the central portion of the mask body portion 101 and deformed along the shape of the lower portion of the water vapor generating body 120. In this embodiment, since the water vapor generating body 120 can be fixed to the mask body 101 at a specific position, it is easy to warm and humidify the space in the mask 110 from the nose of the wearer to the cheek. Preferably, the receiving body 104 is fixed near the folding line 103 of the mask body portion 101 and near the upper end portion of the mask body portion 101. In this embodiment, the receiving body 104 has an opening portion on the upper end portion or the ear-mounting portion 102 side so that the water vapor generating body 120 can be placed and held, and the other end portions are fixed to the mask body portion 101. The position of the opening is not particularly limited, as long as the water vapor generating body 120 is not exposed from the container 104 when the mask 110 is worn. The size of the storage body 104 is only required to be capable of accommodating the water vapor generating body 120 and fixing the position of the water vapor generating body 120. The storage body 104 is air-permeable and can be made of the same material as the mask body portion 101. From the viewpoint of preventing excessive heating and effectively providing the heating and humidifying performance generated by the water vapor generating body 120 in the mask 110, the ventilation resistance of the containing body 104 is preferably 1 Pa or more and 100 Pa or less, more preferably It is 1 Pa or more and 50 Pa or less, and more preferably 1 Pa or more and 30 Pa or less. The ear-mounting portions 102 are used in pairs, and are respectively provided at left and right end portions in the longitudinal direction (X direction) of the mask body portion 101. In this embodiment, as shown in FIGS. 1 and 2, an example in which the ear-mounting portion 102 is formed on the end portion of the mask body portion 101 with a stretchable cord-like material such as a rubber string will be described, but it can also be used. An elastic member integrated with the mask body 101. The ear-mounting portion 102 may be the same material as the mask body portion 101 or a different material. [Water Vapor Generator] The water vapor generator 120 is attached to the mask body 101. Studies by the inventors have found that the area of the planar shape of the water vapor generating body 120 is set to a specific ratio with respect to the area of the entire surface of the wearer's side of the mask body 101, and the water vapor generating body 120 is By using a sheet material having a specific air permeability, the generated water vapor can be appropriately retained inside the mask 110, and the breathability of the mask 110 can be ensured to the extent that the wearer is not stuffy. From the viewpoint of increasing the absolute humidity inside the mask 110 when the mask is used, the ratio of the area occupied by the water vapor generating body 120 to the entire area of the wearer-side surface of the mask body 101 is 30% or more. It is preferably at least 40%, more preferably at least 45%. From the viewpoint of ensuring proper air permeability as the mask 110, the ratio of the area occupied by the water vapor generating body 120 to the entire area of the wearer-side surface of the mask body 101 is preferably 80% or less. It is 70% or less, and more preferably 65% or less. From the same viewpoint, the ratio of the area occupied by the water vapor generating body 120 to the entire area of the wearer-side surface of the mask body 101 is 30% or more and 80% or less, preferably 40% or more and 70% or less, more preferably 45% or more and 65% or less. Here, the entire area of the wearer-side surface of the mask body portion 101 refers to the entire area of the sheet constituting the mask body portion 101, and refers to the surface including the area of the water vapor generating body 120 provided therein The entire area does not include the ear-mounting portion 102. More specifically, it refers to the following line B to C: When the mask is folded longitudinally at the center, the line connecting the most distant points up and down is set to the A line, and the direction perpendicular to the front end is farthest from the line. The point on the folding line of line A is the front end of the mask, line B is a line passing through the front end of the mask and parallel to the above line A, and line C is a line 7 cm away from the line B in the direction of the mounting ears. When the folded portion of the front end of the mask is tightly sealed by heat sealing or the like, the end on the ear side of the sealed width portion is set as the front end to measure the distance. Furthermore, in the case of a pleated mask, the distance is measured symmetrically from the front end of the mask to the side of the mounting ears while the mask is stretched up and down and the creases at the center of the mask are stretched. The creases of the remaining folds are not included in the area. Furthermore, even when the ear-mounting portion 102 includes a fiber sheet or the like, this area is not included in the entire area of the wearer-side surface of the mask body portion 101. On the other hand, the area of the water vapor generating body 120 refers to the area under the planar shape of the bag body 122 accommodating the water vapor generating portion 121 described below, and also refers to the area including the sealed portion of the sheet material constituting the bag body. In this embodiment, the water vapor generating body 120 is attached to the mask body portion 101. A space surrounded by a face recess between the nose and cheeks and a water vapor generating body 120 is generated on the skin side of the mask body 101 when worn, and the temperature and temperature in the mask 110 are increased without inhibiting water vapor generation. From the viewpoint of absolute humidity, it is preferable that the position of the water vapor generating body 120 is, as shown in FIGS. 1 and 2, symmetrically mounted near the folding line 103 of the mask body portion 101 and near the upper end of the mask body portion 101. The vicinity of the fold line 103 and the upper end portion of the mask body portion 101 are not limited to contact with the fold line 103 and the upper end portion of the mask body portion 101, but indicate the area around the fold line 103 and the upper end portion of the mask body portion 101. The water vapor generating body 120 installed on the mask body 101 covers the nose of the wearer. In addition, the water vapor generating body 120 can also reach the cheek of the wearer, and the recess of the face between the nose and the cheek and the water vapor generating body 120 are generated on the skin side of the mask body 101 when worn. From the viewpoint of increasing the temperature and absolute humidity in the mask 110 without suppressing the generation of water vapor, it is preferable that the space is not only covering the cheeks. Regarding the position of the water vapor generating body 120, from the viewpoint of increasing the temperature and absolute humidity in the mask 110 without suppressing water vapor generation when wearing the mask 110, the nose end of the water vapor generating body 120 is linear. In this case, the average value of the shortest distances between the two ends of the straight line and the folding line 103 is preferably 15 mm or less, more preferably 10 mm or less, and further preferably 5 mm or less. When the nose end is curved, the shortest distance from the curve to the fold line 103 is preferably 15 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less. Regarding the position of the water vapor generating body 120, from the same viewpoint, the shortest distance between the upper end portion of the water vapor generating body 120 and the upper end portion of the mask body portion 101 is preferably 15 mm or less, and more preferably 10 mm. Hereinafter, it is more preferably 5 mm or less. The planar shape of the water vapor generating body 120 is not particularly limited, and may be a circular shape, a polygonal shape, or the like. From the viewpoints of manufacturing efficiency, ease of operation, and heating and humidifying effects, rectangular shapes such as rectangles and approximately squares are preferred, and from the viewpoint of ease of operation, approximately square shapes are more preferred. When the nasal end of the water vapor generating body 120 is linear, it is preferable that the portion of the folding line 103 of the mask body 101 that is in contact with the water vapor generating body 120 is linear. In addition, from the viewpoint of maintaining the shape of the mask, increasing the absolute humidity inside the mask, and preventing the suffocation caused by the mask from being impeded due to the adhesion of the mask to the skin around the nose with inhalation, the water vapor generating body 120 The rigidity value in the vertical direction measured under the following conditions is preferably 30 gf / 60 mm width or more, more preferably 60 gf / 60 mm width or more, and even more preferably 70 gf / 60 mm width or more. In addition, from the viewpoint of good wearing feeling during wearing, the rigidity value in the vertical direction of the water vapor generating body 120 is preferably 150 gf / 60 mm width or less, and more preferably 130 gf / 60 mm width or less. , And more preferably 120 gf / 60 mm or less in width. In addition, the rigidity value of the water vapor generating body 120 in the vertical direction measured under the following conditions is preferably 30 gf / 60 mm width or more and 150 gf / 60 mm width or less, and more preferably 60 gf / 60 mm width or more. The width is 130 gf / 60 mm or less, and more preferably 70 gf / 60 mm or more and 120 gf / 60 mm or less. [Rigidity measurement conditions] A Tensilon universal testing machine (ORIENTEC RTC-1150A) was used to support a water vapor generator with a span distance of 30 mm, and a plate-shaped pressing member with a width of 60 mm and a tip radius of 5 mm was applied to the test piece. A load was applied to the center of the (water vapor generating body) at a crosshead speed of 20 mm / min. The peak load at this time (the average of 3 measurements) was set to a rigid value. In this measurement, the water vapor generating body 120 itself may be used as a measurement sample, or the mask 110 containing the water vapor generating body 120 may be used as a measurement sample. As shown in FIG. 9, the water vapor generating body 120 contains a water vapor generating unit 121 inside. In this embodiment, the water vapor generating body 120 includes a water vapor generating portion 121 and a bag body 122 accommodating the same. The bag body 122 includes a first sheet 122A on the surface of the wearer's side (skin side), and a second sheet 122B on a surface opposite to the surface of the wearer's side (skin side). Further, the water vapor generating body 120 reacts with oxygen in the air to generate heat while generating water vapor. When the water vapor generating body 120 is detachable from the mask 110, the water vapor generating body 120 is installed in an oxygen blocking bag before use. The entirety of the oxygen blocking bag has an oxygen barrier property, so that the water vapor generating body 120 does not contact the oxygen in the air. As the oxygen barrier material of the oxygen blocking bag, for example, its oxygen transmission coefficient (ASTM D3985) is 10 cm 3 ・ Mm / (m 2 ・ Day ・ MPa), especially 2 cm 3 ・ Mm / (m 2 ・ Day ・ MPa) is preferred. Specifically, a film such as an ethylene-vinyl alcohol copolymer or polyacrylonitrile, or a film obtained by vapor-depositing ceramics, aluminum, or the like on such a film can be mentioned. In the case where the water vapor generating body 120 is enclosed in the mask 110, the entire face mask 110 may be sealed in an oxygen blocking bag to prevent the water vapor generating body 120 from contacting oxygen in the air. The water vapor generating section 121 can take various forms. The water vapor generating unit 121 may be, for example, a mixture of powder, a sheet shape such as a sheet, or a coated sheet obtained by applying a dispersion liquid to a base material. Examples of the water vapor generating section 121 include an oxidized metal, a water-absorbing agent, water, an electrolyte, and other reaction promoters as needed. When the water vapor generating portion 121 comes into contact with air, the oxidized metal contained therein undergoes an oxidation reaction, thereby generating heat. The water contained in the water vapor generation unit 121 is heated by the heat, and becomes water vapor at a specific temperature, and is released to the outside through the bag body 122. Water vapor is released from the air-permeable portion in the bag body 122 to the outside. The oxidized metal is a metal that generates an oxidation reaction heat, and examples thereof include one or two or more kinds of powders or fibers selected from iron, aluminum, zinc, manganese, magnesium, and calcium. Among them, iron powder is preferred in terms of operability, safety, manufacturing cost, storage stability, and stability. Examples of the iron powder include one or two or more kinds selected from reduced iron powder and atomized iron powder. When the oxidized metal is a powder, from the viewpoint of efficiently performing the oxidation reaction, the average particle diameter is preferably 0.1 μm or more, more preferably 10 μm or more, and even more preferably 20 μm or more. From the same viewpoint, it is preferably 300 μm or less, more preferably 200 μm or less, and still more preferably 150 μm or less. Furthermore, from the viewpoint of making the coatability good, the average particle diameter is preferably 10 μm or more and 200 μm or less, and more preferably the average particle diameter is 20 μm or more and 150 μm or less. In addition, from the viewpoint of improving the fixability of a water-retaining material such as a fibrous material and controlling the reaction, it is also preferable to use an oxidized metal containing 50% by mass or more of a particle diameter of 0.1 to 150 μm. The particle size of the oxidized metal refers to the maximum length in the form of a powder, and is measured by using a sieve classification, a dynamic light scattering method, a laser diffraction-scattering method, and the like. The content of the oxidized metal in the water vapor generating section 121 is expressed in basis weight, preferably 100 g / m 2 Above, more preferably 200 g / m 2 the above. The content of the oxidized metal in the water vapor generating section 121 is preferably 3000 g / m in terms of basis weight. 2 Below, more preferably 1600 g / m 2 the following. Also, preferably 100 g / m 2 Above 3000 g / m 2 Below, more preferably 200 g / m 2 Above 1600 g / m 2 the following. Thereby, the heating temperature of the water vapor generating body 120 can be raised to a desired temperature. Here, the content of the oxidized metal can be determined by an ash test in accordance with JIS P8128 or a thermogravimeter. In addition, it can be quantified by a vibration sample-type magnetization measurement test or the like by utilizing the property of magnetization when an external magnetic field is applied. The type of the water-absorbing agent is not particularly limited as long as it can retain water, and examples thereof include one or two or more kinds selected from a carbon component, a fibrous substance, a water-absorbing polymer, and a water-absorbing powder. The water-absorbing agent is appropriately used depending on the form of the water vapor generating section 121. As the carbon component, those having water retaining ability, oxygen supplying ability, and catalyst ability can be used. For example, one or two or more kinds selected from activated carbon, acetylene black, and graphite can be used. Among them, activated carbon is preferred, and one or two or more types of fine powder or small particles selected from coconut shell carbon, wood flour carbon, and peat carbon are more preferred. Among them, wood flour carbon is more preferred from the viewpoint of obtaining a good heating and humidifying effect. The water-absorbing agent preferably has an average particle diameter of 10 μm or more, and more preferably 12 μm or more. The water-absorbing agent preferably has an average particle diameter of 200 μm or less, and more preferably 100 μm or less. The water-absorbing agent preferably has an average particle diameter of 10 μm or more and 200 μm or less, and more preferably has an average particle diameter of 12 μm or more and 100 μm or less. The average particle diameter of the water-absorbing agent refers to the maximum length in the form of a powder, and is measured by a dynamic light scattering method, a laser diffraction method, and the like. The carbon component is preferably a powdered form, or a form other than a powdered form, for example, a fibrous form may be used. As the fibrous substance, natural or synthetic fibrous substances can be used without particular limitation. Examples of natural fibrous materials include cotton, kapok, wood pulp, non-wood pulp, peanut protein fiber, zein fiber, soy protein fiber, mannan fiber, rubber fiber, hemp, manila hemp, ramie hemp, New Zealand Plant fiber such as zea linen, apocynum, coconut, rush, straw. In addition, wool, goat hair, mohair, cashmere, Alpaca, Angora, camel hair, llama hair, silk, feather, down, feather, trehalose fiber, chitin fiber, casein Animal fibers such as protein fibers. Further examples thereof include mineral fibers such as asbestos. On the other hand, examples of synthetic fibrous materials include semi-synthetic materials such as rhenium, slime, copper ammonia fiber, acetate, triacetate, oxidized acetate, Promix, chlorinated rubber, and hydrochloric acid rubber. fiber. In addition, polyesters such as nylon, aromatic polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, and polyethylene terephthalate, polyacrylonitrile, acrylic resin, polyethylene, Synthetic polymer fibers such as polypropylene, polystyrene, and polyurethane. Furthermore, metal fibers, carbon fibers, glass fibers, and the like can also be used. These fibers can also be used alone or in combination. Among these, it is preferably used in terms of fixation with an oxidized metal or a reaction accelerator, flexibility of the water vapor generating portion 121, oxygen permeability, a sheet form maintenance function, and manufacturing cost. Wood pulp, cotton, polyethylene fiber, polyester fiber. In addition, wood pulp and cotton have the function of supporting and fixing solid objects such as iron powder. Examples of the water-absorptive polymer include a hydrophilic polymer having a crosslinked structure that can absorb and maintain a liquid having a weight of 20 times or more. Examples of the water-absorbing powder include one or two or more selected from vermiculite, calcium silicate, sawdust, alumina, silicone, and pulp powder. When the water vapor generating portion 121 is in a sheet shape, it is preferable to use a fibrous substance as the water-absorbing agent. The reason is that the fibrous material has both a function as a water-retaining material and a function of maintaining the sheet form in the water vapor generating portion 121. As a result, the localization of the oxidized metal is less likely to occur, and the heating temperature distribution of the water vapor generating portion 121 becomes uniform. When the water vapor generating portion 121 is a mixture containing powder, it is preferable to use a superabsorbent polymer, vermiculite, calcium silicate, silicon gel, silicon oxide porous material, aluminum oxide, wood powder, or the like as water absorption. Agent. The content of the water-absorbing agent is preferably 0.3 parts by mass or more, more preferably 1 part by mass or more, and still more preferably 3 parts by mass or more with respect to 100 parts by mass of the oxidized metal. The content of the water-absorbing agent is preferably 100 parts by mass or less, more preferably 80 parts by mass or less, and still more preferably 60 parts by mass or less with respect to 100 parts by mass of the oxidized metal. The content of the water-absorbing agent is preferably 0.3 parts by mass or more and 100 parts by mass or less, more preferably 1 part by mass or more and 80 parts by mass or less, and more preferably 3 parts by mass or more with respect to 100 parts by mass of the oxidized metal. And 60 mass parts or less. Thereby, the water vapor | steam generator 120 obtained can store the water | moisture necessary for continuing an oxidation reaction. In addition, the supply of oxygen to the water vapor generating section 121 can be sufficiently obtained, and a water vapor generating body 120 having a high heat generation efficiency can be obtained. In addition, the heat capacity of the water vapor generating body 120 with respect to the calorific value obtained can be suppressed to be small, so that the heating temperature rise can be increased, a desired temperature rise can be obtained, and the heating reaction can be promoted. In addition, the content of the water-absorbing agent is preferably 4 g / m in terms of basis weight. 2 Above 290 g / m 2 Below, more preferably 7 g / m 2 Above 160 g / m 2 the following. Thereby, the thickness of the water vapor | steam generating part 121 can be made thin, it is not too large as a product, and it has flexibility. For example, the thickness of the water vapor generating portion 121 can be set to 0.1 mm to 2 mm. Examples of the electrolyte include sulfates, carbonates, chlorides, and hydroxides of alkali metals, alkaline earth metals, and transition metals. Among these, in terms of excellent conductivity, chemical stability, and production cost, it is preferable to use an alkali metal, alkaline earth metal, or transition metal chloride, and it is particularly preferable to use sodium chloride, potassium chloride, Calcium chloride, magnesium chloride, ferrous chloride, ferric chloride. The water vapor generating section 121 includes water. Water is not particularly limited as long as it is derived from an aqueous electrolyte solution (eg, an aqueous solution of an alkali metal, an alkaline earth metal, or the like), or it may be water added to the water vapor generating unit 121 alone. The water content in the water vapor generating portion 121 is preferably 35 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the oxidized metal. By setting the water content of the water vapor generating part 121 to 200 parts by mass or less relative to 100 parts by mass of the oxidized metal, the water vapor generating part 121 generates heat well, and the heating temperature rises faster (the heating time becomes shorter). fast). In addition, by setting the water content of the water vapor generating unit 121 to 35 parts by mass or more relative to 100 parts by mass of the oxidized metal, the water content necessary for the exothermic reaction of the water vapor generating unit 121 can be ensured, so that The exothermic reaction of the water vapor generating section 121 continues well. As described above, by setting the water content of the water vapor generating part 121 to 35 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the oxidized metal, the water vapor generating part 121 having a good heating state can be obtained. That is, the amount of water in the water vapor generating section 121 affects the rate of heat generation. By setting the water content to 35 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the oxidized metal, heat generation is performed well, the heating temperature rises faster, and the heating temperature is continued. From the same viewpoint, the water content of the water vapor generating portion 121 is more preferably 40 parts by mass or more, and more preferably 50 parts by mass or more, based on 100 parts by mass of the oxidized metal. The water content of the water vapor generating unit 121 is preferably 200 parts by mass or less, more preferably 150 parts by mass or less, still more preferably 100 parts by mass or less, and even more preferably 80 parts by mass relative to 100 parts by mass of the oxidized metal. Mass parts or less. The water content of the water vapor generating portion 121 is more preferably 40 parts by mass or more and 150 parts by mass or less with respect to 100 parts by mass of the oxidized metal, and more preferably 50 parts by mass or more and 100 parts by mass or less, and more preferably It is 50 mass parts or more and 80 mass parts or less. The water vapor generation unit 121 may include a thickener, a surfactant, a medicament, a coagulant, a colorant, a paper strengthening agent, and a pH adjuster (e.g., tripotassium phosphate, etc.) in addition to the above components ), Fluffy agents, etc. As the thickener, a substance that absorbs water to increase the thickness or impart thixotropy can be used. A substance selected from alginates such as sodium alginate, acacia gum, tragacanth gum, locust bean gum, guar gum, carrageenan Polysaccharide based thickeners such as carrageenan, agar, and xanthan gum; starch based thickeners such as dextrin, alpha starch, and processing starch; carboxymethyl cellulose, ethyl acetate cellulose, and hydroxyethyl fiber Cellulose, hydroxymethylcellulose or hydroxypropylcellulose-based thickeners; thickeners such as polyvinyl alcohol (PVA); metal soap-based thickeners such as stearates; minerals such as bentonite A mixture of 1 or more types of thickeners. Among them, from the viewpoint of maintaining a fixed amount of water in the water vapor generating portion 121, a polysaccharide-based thickener is preferred, and a saponin is more preferred. In the case where the water vapor generating portion 121 is a coated sheet, the content of the tackifier is preferably 0.1 part by mass or more with respect to 100 parts by mass of the oxidized metal in terms of ease of coating. It is 0.2 parts by mass or more. The content of the tackifier is preferably 5 parts by mass or less, and more preferably 4 parts by mass or less, based on 100 parts by mass of the oxidized metal. The content of the tackifier is preferably 0.1 parts by mass or more and 5 parts by mass or less, and more preferably 0.2 parts by mass or more and 4 parts by mass or less with respect to 100 parts by mass of the oxidized metal. Moreover, when the water vapor | steam generating part 121 is a sheet form, it is preferable to form a some hole and / or cut. Thereby, even if the sheet-shaped water vapor generating part 121 is thin, a sufficiently high heat generation characteristic can be obtained, and a desired water vapor release characteristic can be obtained. From the point of obtaining sufficient heating characteristics, the area of the hole is preferably 0.01 to 10 mm 2 , Particularly preferably 0.1 to 8 mm 2 . For the same reason, it is preferable that the water vapor generating portion 121 having holes in the sheet shape is formed with 0.1 to 20 holes / cm. 2 , Especially preferably 1 to 15 pieces / cm 2 . Examples of the shape of the hole include a circle, a rectangle, a polygon, an oval, an oval, or a combination of two or more of these. On the other hand, when a cut is formed, the length is preferably 1 to 50 mm, and more preferably 5 to 30 mm. The water vapor generating section 121 is housed in a bag body 122 including a first sheet 122A and a second sheet 122B of the water vapor generating body 120. That is, the water vapor generating body 120 is configured by including the first sheet material 122A and the second sheet material 122B, and is preferably configured by hermetically joining the peripheral edges of the first sheet material 122A and the second sheet material 122B.袋 体 122。 The bag body 122. A region other than the peripheral edge portion of the first sheet material 122A and the second sheet material 122B is a non-joined area, and a water vapor generating portion 121 is disposed in the non-joined area. In this embodiment, the water vapor generating unit 121 has the following configuration. That is, in the water vapor generating body 120, the first sheet 122A is disposed on the wearer-side surface of the water vapor generating section 121, and the air permeability of the first sheet 122A is 7000 seconds / 100 ml or less. A second sheet 122B is disposed on the surface of the water vapor generating portion 121 opposite to the wearer's side, and the air permeability of the second sheet 122B exceeds 8000 seconds / 100 ml. These structures are described in detail below. In this embodiment, the surface of the water vapor generating body 120 on the wearer's side becomes the first sheet 122A. Here, the air permeability of the first sheet 122A is 7000 seconds / 100 ml or less. From the viewpoint of maintaining the space surrounded by the recess of the face between the water vapor generating body 120 and the nose and cheeks, ensuring the air permeability, and allowing the large amount of water vapor from the water vapor generating body 120 to be easily released to the outside of the bag body 122 In terms of the air permeability of the first sheet 122A, it is preferably 5000 seconds / 100 ml or less, more preferably 2500 seconds / 100 ml or less, even more preferably 1000 seconds / 100 ml or less, and still more preferably 600 seconds / 100. ml or less, more preferably 10 seconds / 100 ml or less, still more preferably 5 seconds / 100 ml or less, and even more preferably 0 seconds / 100 ml. As the first sheet 122A having such air permeability, it is preferable to use, for example, a porous sheet made of a synthetic resin that has moisture permeability but does not have water permeability. Specifically, a polyethylene film containing calcium carbonate and the like and stretched can be used. When the porous sheet is used, various types represented by one or two or more types of non-woven fabrics selected from a needle-punched nonwoven fabric, a hot-air nonwoven fabric, and a spunbond nonwoven fabric may be laminated on the outer surface of the porous sheet. Fiber sheet to improve the texture of the first sheet 122A. In addition, as long as the first sheet 122A satisfies the above-mentioned air permeability, a part of the first sheet 122A may be an air-impermeable sheet having no air permeability. A part of the second sheet 122B may be a breathable sheet or a non-breathable sheet, and generally a sheet having a lower breathability is used. Specifically, as the air permeability of the second sheet material 122B, the condition of more than 8000 seconds / 100 ml is adopted. From the viewpoint of effectively heating and humidifying the inside of the mask body 101 stably, it is preferable not to Breathable sheet. As long as the second sheet 122B satisfies the above-mentioned air permeability, it can be used as one or more layers of synthetic resin films or laminated on the outer surface of the one or more layers of synthetic resin films to be selected from needle-punched nonwoven fabrics and hot air. Non-woven fabrics and spunbond non-woven fabrics are represented by various types of fiber sheets, and the texture of the second sheet 122B is improved. Specifically, a two-layer film including a polyethylene film and a polyethylene terephthalate film, a laminated film including a polyethylene film and a non-woven fabric, a laminated film including a polyethylene film and a pulp sheet, and the like are used. It is preferably a laminated film comprising a polyethylene film and a pulp sheet. As long as the second sheet material 122B satisfies the above-mentioned air permeability value, the same material as the first sheet material 122A may be used, or a different material may be used. The air permeability of the second sheet 122B is preferably 10,000 seconds / 100 ml or more, more preferably 30,000 seconds / 100 ml or more, and even more preferably 80,000 seconds / 100 ml or more. By setting the air permeability of the second sheet 122B in this way, the vapor generated by the water vapor generating section 121 can be efficiently released from the first sheet 122A side, and the expansion of the water vapor generating body 120 can be suppressed. Among them, from the viewpoint of making the oxidation reaction of the oxidized metal favorable and generating a large amount of water vapor from the first sheet 122A side, it is particularly preferable to set the air permeability of the first sheet 122A to 2500 seconds / 100 ml or less. The air permeability of the second sheet 122B is set to 80,000 seconds / 100 ml or more. In this case, the surface of the water vapor generating portion 121 opposite to the wearer's side, that is, the surface from the water vapor generating portion 121 to the water vapor generating body 120 on the opposite side to the wearer. Between the outer layers are arranged air-impermeable or hardly air-permeable sheets, more preferably air-impermeable sheets. Accordingly, it is possible to prevent the water vapor generated by the water vapor generating unit 121 from leaking to the outside of the mask 110, and to impart water vapor to the inside of the mask 110, that is, the wearer's side. An example of a method for manufacturing the water vapor generating section 121 will be described below. In the case where the water vapor generating section 121 is in the form of a sheet, for example, the wet copying method described in Japanese Patent Application Laid-Open No. 2003-102761, which is the applicant's previous application, or a die coater can be used. The extrusion coating method. In this case, first, a formed sheet containing an oxidized metal, a water-absorbing agent, and a reaction accelerator is formed by a wet paper copying method, and an aqueous electrolyte solution is added to the formed sheet to obtain a sheet-shaped water vapor. Generating section 121. The obtained sheet-shaped water vapor generating part 121 may be used in one sheet, or a plurality of sheets may be used in stack. Alternatively, one water vapor generating unit 121 may be folded, and a plurality of folded water vapor generating units 121 may be stacked and used. When the water vapor generating section 121 includes powder, the powdery water vapor generating section 121 is obtained by uniformly mixing the constituent materials. More specifically, first, a water-absorbing agent such as a superabsorbent polymer is uniformly mixed with the oxidized metal, and an aqueous electrolyte solution is added thereto to adhere the oxidized metal to the surface of the water-absorbing agent. Thereafter, a water vapor generating portion 121 is prepared by adding a reaction accelerator or the like as a remaining material. By preparing the water vapor generating portion 121 in this way, the rise time of the oxidation reaction is increased, and the amount of water vapor evapotranspiration per unit time is easily maximized. When the water vapor generating unit 121 includes a coated sheet, for example, the water-repellent sheet may be coated by a method described in Japanese Patent Application Laid-Open No. 2013-146554, which is a previous application of the present applicant. The cloth heating powder aqueous dispersion is obtained by cutting a continuous strip of a heating object having a heating layer and a water retaining sheet into an arbitrary size. The water vapor generating part 121 may be accommodated in a single state or in a multilayer state in which a plurality of layers are stacked. Here, the structure of the water vapor | steam generator 120 in the case where the water vapor | steam generator 121 includes a coating sheet is demonstrated below. As shown in FIG. 9, the water vapor generating section 121 includes a water vapor generating layer 121A between the base material layer 121B and the water retaining sheet 121C. The water vapor generating layer 121A is in direct contact with the water retaining sheet 121C. The water vapor generating body 120 is located in the bag body 122 having the first sheet material 122A and the second sheet material 122B, with the water retaining sheet 121C side, that is, the first sheet material 122A side being positioned on the skin side of the wearer, and the substrate layer 121B includes a water vapor generating unit 121 so that it is disposed on the second sheet 122B side. Thereby, the vapor | steam from the water vapor | steam generating part 121 can be efficiently discharged from the 1st sheet material 122A. In addition, the water vapor generating layer 121A may be provided on one side of the water retaining sheet 121C, or may be provided in the form of sandwiching the water retaining sheet 121C and the base material layer 121B. FIG. 9 shows an example in which the water vapor generating layer 121A is provided to sandwich the water retaining sheet 121C and the base material layer 121B. The water retaining sheet 121C contains water. The content of water can be, for example, 10% by mass or more and 45% by mass or less of the maximum water absorption of the water-retaining sheet 121C. The maximum water absorption of the water retaining sheet 121C can be calculated as follows. The water-retaining sheet 121C was cut into 25 cm 2 Mass after dimension (W 0 ), And immersed in a 5 mass% sodium chloride aqueous solution for 5 minutes. Take out with tweezers and hang it in the air for 1 minute so that the excess water drops behind, and measure the mass (W 1 ), The maximum water absorption (W max ). W max = W 1 －W 0 The moisture content contained in the water-retaining sheet 121C is preferably 50 to 350 g / m in terms of basis weight. 2 , And more preferably 180 to 260 g / m 2 . Since the amount of water contained in the water-retaining sheet 121C becomes a source of water vapor generation, it is preferable to set the amount of water contained in the water-retaining sheet 121C as a basis weight to 50 g / m. 2 The above can ensure a good amount of steam generation. In addition, the water-retaining sheet 121C has air permeability resistance due to water absorption (the air permeability is lowered due to water absorption and swelling than when it is dried). Therefore, it is preferably set to 350 g / m by the basis weight. 2 In the following, the steam can be easily released from the water-retaining sheet 121C, and since the air permeability to the water-vapor generating layer 121A is sufficiently ensured, the oxygen supply can be sufficiently obtained to obtain the water-vapor generating body 120 having high heat generation efficiency. In addition, the air permeability of the water-retaining sheet 121C is preferably 500 seconds / 100 ml or less in terms of air permeability including water, and in view of air permeability and ease of vapor transmission, it is more preferably 300 seconds / 100 ml or less. It is more preferably 50 seconds / 100 ml or less. In addition, the lower limit of the air permeability in a state including moisture (that is, the moisture content is 15% by mass or more and 30% by mass or less of the maximum water absorption of the water retaining sheet 121C) is, for example, 1 second / 100 ml. Here, as the water-retaining sheet 121C, a sheet material capable of absorbing and retaining moisture and having flexibility is used. Examples of such materials include fiber sheets such as paper, nonwoven fabrics, woven fabrics, and knitted fabrics using fibers as raw materials. Moreover, porous bodies, such as a sponge, are mentioned. Examples of the fiber include a natural fiber such as a plant fiber or an animal fiber as a main component or a chemical fiber as a main component. Examples of plant fibers include cotton, kapok, wood pulp, non-wood pulp, peanut protein fiber, zein fiber, soy protein fiber, mannan fiber, rubber fiber, hemp, manila hemp, ramie hemp, and New Zealand. One or more of blue hemp, apocynum, coconut, rush, and straw. Examples of animal fibers include wool, goat hair, mohair, cashmere, Alpaca, Angora, camel hair, llama hair, silk, feather, down, feather, trehalose fiber, One or more types of chitin fiber and casein fiber. Examples of the chemical fiber include one or two or more selected from the group consisting of osmium, acetate, and cellulose. Among them, the water-retaining sheet 121C is preferably one containing a fiber material containing the fibers and a water-absorbing polymer. As the water-absorbing polymer, it is preferable to use a hydrogel material that can absorb and maintain a liquid that is 20 times or more of its own weight, because the water content of the water-retaining sheet 121C can be maintained at 15-30% by mass of the maximum water absorption of the water-retaining sheet 121C. Examples of the shape of the particles of the water-absorbing polymer include a spherical shape, a block shape, a grape bunch shape, and a fibrous shape. From the viewpoint of ease of handling during production, the particle diameter of the particles of the water-absorbing polymer is preferably 1 μm or more, and more preferably 10 μm or more. From the viewpoint of the water absorption rate, the particle diameter of the particles of the water-absorbing polymer is preferably 1,000 μm or less, and more preferably 500 μm or less. The particle diameter of the particles of the water-absorbing polymer is preferably 1 μm or more and 1000 μm or less, and more preferably 10 μm or more and 500 μm or less. The particle size of the water-absorbing polymer particles is measured by a dynamic light scattering method, a laser diffraction method, or the like. Specific examples of the water-absorbing polymer include polymers selected from starch, croscarmellose, polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid, polyacrylic acid and its salts, and polyacrylate graft polymerization. One or more species. Among them, polymers or copolymers of acrylic acid or acrylic acid alkali metal salts, polyacrylic acid and its salts, and polyacrylate graft polymers are preferably used. The base material layer 121B is provided on the surface of the water vapor generating layer 121A opposite to the water retaining sheet 121C. The base material layer 121B is in direct contact with the water vapor generating layer 121A, and covers the water vapor generating layer 121A. The base material layer 121B is preferably an air-impermeable or hardly air-permeable sheet, and for example, a resin sheet is preferably used. By making the sheet impermeable or hardly air-permeable (more than 50,000 seconds / 100 ml, preferably more than 80,000 seconds / 100 ml), not only can steam be more reliably released from the 121C side of the water-retaining sheet, but also It is possible to prevent the heat of vaporization from being taken away by the substrate layer 121B side. Examples of the base material layer 121B include a synthetic resin film, and a polyethylene film, a polyethylene terephthalate film, and the like. In addition, when the water-retaining sheet 121C is formed on the water vapor generating layer 121A and the base material layer 121B is not provided, there is a possibility that the water vapor generating portion 121 and the second sheet 122B are in direct contact with each other, so it is preferable. The second sheet 122B is a sheet having water resistance. From the viewpoint of imparting a moderate vapor sensation to a mask wearer, the water vapor generation amount of the water vapor generator 120 in this embodiment is preferably 30 mg / unit for 10 minutes or more as a whole of the water vapor generator 120. More preferably 50 mg / unit · 10 min or more, further preferably 150 mg / unit · 10 min or more, even more preferably 250 mg / unit · 10 min or more, and even more preferably 300 mg / unit · 10 min or more . From the viewpoint of suppressing dew condensation in the mask, the amount of water vapor generated by the water vapor generator 120 in this embodiment is preferably 1200 mg / unit · 10 minutes or less, and more preferably 1000 mg / unit · 10 minutes or less, more preferably 800 mg / unit · 10 minutes or less, still more preferably 700 mg / unit · 10 minutes or less, and even more preferably 500 mg / unit · 10 minutes or less. The water vapor generating amount of the water vapor generating body 120 in the present embodiment is preferably 30 mg / unit · 10 min or more and 1200 mg / unit · 10 min or less, and more preferably 50 mg as the whole of the water vapor generating body 120. / Unit: 10 min or more and 1000 mg / unit · 10 min or less, further preferably 150 mg / unit · 10 min or more and 800 mg / unit · 10 min or less, further preferably 250 mg / unit · 10 min or more 700 mg / unit · 10 minutes or less, more preferably 300 mg / unit · 10 minutes or more and 500 mg / unit · 10 minutes or less. In addition, from the viewpoint of imparting a moderate vapor sensation to the mask wearer, the water vapor generation amount per unit area of the water vapor generator 120 in this embodiment is preferably 1 mg / cm 2 ・ More than 10 min, more preferably 1.5 mg / cm 2 ・ More than 10 min, more preferably 5 mg / cm 2 ・ More than 10 min, more preferably 7 mg / cm 2 ・ More than 10 min, more preferably 9 mg / cm 2 ・ 10 minutes or more. From the viewpoint of suppressing dew condensation in the mask, the water vapor generation amount per unit area of the water vapor generator 120 in this embodiment is preferably 20 mg / cm as a whole of the water vapor generator 120. 2 ・ Less than 10 min, more preferably 18 mg / cm 2 ・ Less than 10 min, more preferably 15 mg / cm 2 ・ 10 minutes or less. The amount of water vapor generated per unit area of the water vapor generator 120 in this embodiment is preferably 1 mg / cm as a whole of the water vapor generator 120. 2 ・ 10 min or more and 20 mg / cm 2 ・ Less than 10 min, more preferably 1.5 mg / cm 2 ・ 10 min or more and 18 mg / cm 2 ・ Less than 10 min, more preferably 5 mg / cm 2 ・ More than 10 min and 15 mg / cm 2 ・ Less than 10 min, more preferably 7 mg / cm 2 ・ More than 10 min and 15 mg / cm 2 ・ Less than 10 min, more preferably 9 mg / cm 2 ・ More than 10 min and 15 mg / cm 2 ・ 10 minutes or less. [Water vapor generation amount measuring method] Here, the water vapor generation amount of the water vapor generating body 120 or the steam warming mask 100 is a value measured in the following manner using the device 30 shown in FIG. 11. The device 30 shown in FIG. 11 includes an aluminum measurement chamber (volume 2.1 L) 31, an inflow path 32 for allowing dehumidified air (humidity less than 2%, flow rate 2.1 L / min) to flow into the lower portion of the measurement chamber 31, and self-measurement of air An outflow path 33 flowing out of the upper part of the chamber 31, an inlet temperature and humidity meter 34 and an inlet flow meter 35 provided in the inflow path 32, an outlet temperature and humidity meter 36 and an outlet flow meter 37 provided in the outflow path 33, and an measurement chamber 31 Inside the thermometer (thermistor) 38. As the thermometer 38, a temperature resolution force of about 0.01 ° C is used. The measurement of the surface temperature of the water vapor generating body 120 or the steam warming mask 100 on the skin side is carried out at a measurement ambient temperature of 30 ° C (30 ± 1 ° C), and the water vapor generating body 120 is taken out of the oxygen blocking bag. The water vapor generating body 120 or the steam warming mask 100 is placed on the skin side surface, that is, the water vapor release side is upwardly placed in the measurement chamber 31, and a thermometer 38 containing a metal ball (4.5 g) is placed thereon. Take measurements. In this state, the dehumidified air flows from the lower part, and based on the temperature and humidity measured by the inlet temperature hygrometer 34 and the outlet temperature hygrometer 36, the difference between the absolute humidity before and after the air flows into the measurement chamber 31 is calculated. From the flow rates measured by the inlet flow meter 35 and the outlet flow meter 37, the amount of water vapor released by the water vapor generating body 120 or the vapor warming mask 100 is calculated. It should be noted that the amount of water vapor generated in the present specification refers to a total amount measured from the time point when the water vapor generating body 120 is taken out from the oxygen blocking bag to 10 minutes later. In addition, from the viewpoint of imparting a moderate sense of steam to the wearer of the mask, the steam generating amount of the steam warming mask 100 according to this embodiment is preferably 60 mg / 10 min or more, and more preferably 100 mg / 10 min. The above is more preferably 300 mg / 10 min or more, more preferably 500 mg / 10 min or more, and even more preferably 600 mg / 10 min or more. In addition, from the viewpoint of suppressing dew condensation in the mask, the amount of water vapor generated by the steam warming mask 100 according to this embodiment is preferably 2000 mg / 10 min or less, more preferably 1400 mg / 10 min or less, and further preferably It is below 1000 mg / 10 min. In addition, the water vapor generation amount of the steam warming mask 100 according to this embodiment is preferably 60 mg / 10 min or more and 2000 mg / 10 min or less, more preferably 100 mg / 10 min or more and 1400 mg / 10 min or less, It is more preferably 300 mg / 10 min or more and 1000 mg / 10 min or less, still more preferably 500 mg / 10 min or more and 1000 mg / 10 min or less, even more preferably 600 mg / 10 min or more and 1000 mg / min. Below 10 min. Next, effects produced by the steam warming mask 100 will be described. The steam warming mask 100 is a combination of the above-mentioned mask 110 and the water vapor generating body 120. The surface of the water vapor generating body 120 on the wearer's side is a sheet having a permeability of 7000 seconds / 100 ml or less. It covers, and the sheet | seat which has a permeability of more than 8000 second / 100 ml is arrange | positioned on the surface opposite to the wearer side surface of the water vapor | steam generator 120. In other words, by setting the air permeability of the first sheet 122A to 7000 seconds / 100 ml or less and the air permeability of the second sheet 122B to exceed 8000 seconds / 100 ml, the water vapor generating portion 121 can be suppressed. The generated water vapor leaks to the outside of the mask 110, and water vapor can be given to the inside of the mask 110, that is, the wearer's side. In addition, by setting the ratio of the area occupied by the water vapor generating body 120 to 30% or more and 80% or less with respect to the entire area of the wearer-side surface of the mask body 101, it is possible to prevent the wearer from being stuffy. The absolute humidity inside the mask 110 is increased. With the synergistic effect of these effects, people can breathe easily, and the heated water vapor can be actively generated in the mask to increase the absolute humidity in the mask, thereby improving the comfort produced by heating and humidification. Wetting with mucous membrane of throat or nose. In addition, with this effect, the discomfort caused by nasal congestion is reduced, thereby obtaining the effects of making breathing easier, improving the mucosal ciliary transport function, and promoting the function of foreign body excretion. The steam warming mask 100 is used, for example, as follows. That is, when the mask 110 is separated from the water vapor generating body 120, the steam warming mask 100 is an unsealed oxygen blocking bag, and the water vapor generating body 120 is taken out and fixed to a specific position of the mask 110. The mask 110 hangs the ear-mounting portions 102 on the ears of the wearer, and wears the mask body 101 to cover the mouth and nose of the wearer. When the water vapor generating body 120 is enclosed in the receiving body 104 in the mask 110, the steam warming mask 100 is generally enclosed in an oxygen blocking bag as a whole. As a method of use in this case, after opening the oxygen blocking bag, take out the steam warming mask 100, hang each ear-mounting portion 102 on the ear of the wearer, and cover the body portion 101 of the mask to cover the mouth of the wearer and Nasal wear. The water vapor generator 120 reacts with oxygen in the air to generate heat and generates water vapor. Then, the water vapor generated in the mask 110 is inhaled from the mouth and nose of the wearer, which can alleviate the dryness of the throat and nose caused by the low-temperature and low-humidity environment, reduce the unpleasant feeling caused by nasal congestion, and obtain a relaxing effect, so that People feel comfortable. In addition, it also caused a feeling of falling asleep. Furthermore, since the mucous membrane of the nasal cavity is warmed and humidified, the foreign body discharge function is improved, and effects such as prevention of colds can be expected. In addition, the lip portion is thin because of the stratum corneum, so it is sensitive to temperature, and it is easy to feel the heat too sensitively due to the heat of the water vapor generating body 120 contacting the lip portion. This problem can be suppressed mildly. In this embodiment, from the viewpoint of bringing comfortable steam to the wearer, the maximum value of the absolute humidity in the steam warming mask 100 in use is preferably 12 g / m 3 Above, more preferably 13 g / m 3 Above, further preferably 15 g / m 3 Above, and further preferably 20 g / m 3 Above, and more preferably 25 g / m 3 the above. From the viewpoint of preventing dew condensation in the mask, the maximum value of the absolute humidity in the mask during use of the steam warming mask 100 is preferably 50 g / m. 3 Below, more preferably 45 g / m 3 Below, more preferably 40 g / m 3 Below, more preferably 35 g / m 3 the following. In addition, the maximum value of the absolute humidity in the mask used in the steam warming mask 100 is preferably 12 g / m 3 Above 50 g / m 3 Below, more preferably 13 g / m 3 Above 45 g / m 3 Below, more preferably 15 g / m 3 Above 40 g / m 3 Below, more preferably 20 g / m 3 Above 35 g / m 3 25 g / m or less 3 Above 35 g / m 3 the following. In addition, in this embodiment, from the viewpoint of bringing comfortable steam to the wearer, the average value of the absolute humidity in the mask used in the steam warming mask 100 is preferably 11.7 g / m 3 Above, more preferably 12 g / m 3 Above, further preferably 13 g / m 3 Above, further preferably 15 g / m 3 Above, and more preferably 19 g / m 3 the above. From the viewpoint of preventing dew condensation in the mask, the average value of the absolute humidity in the mask during use of the steam warming mask 100 is preferably 35 g / m. 3 Below, more preferably 30 g / m 3 Below, more preferably 25 g / m 3 the following. In addition, from the viewpoint of bringing comfortable steam to the wearer, the average value of the absolute humidity in the mask during use of the steam warming mask 100 is preferably 11.7 g / m 3 Above 35 g / m 3 Below, more preferably 12 g / m 3 Above 30 g / m 3 Below, more preferably 13 g / m 3 Above 25 g / m 3 Below, more preferably 15 g / m 3 Above 25 g / m 3 Below, even more preferably 19 g / m 3 Above 25 g / m 3 the following. The absolute humidity during use of the steam warming mask 100 can be measured as follows. [Absolute Humidity Measurement Conditions] Under the environment of 20 ° C and 60% RH, install the temperature and humidity on the lower part of the human head model made using DIGITAL HUMAN TECHNOLOGY Co., Ltd. male head data (average of 52 Japanese adult males) The sensor (SHT71 made by Sensirion) uses a ventilator (HARVARD APPARATUS DUAL PHASE CONTROL RESPIRATOR (made by HARVARD APPARATUS)) from the nose of the head model to simulate human breathing rhythm, 15 times per minute, each Inhale at a frequency of 500 ml. In this state, the steam warming mask 100 is mounted on a human body model, and changes in temperature and humidity are measured and recorded. As the recorder, for example, EK-H4 manufactured by Sensirion is used. According to the temperature and relative humidity, calculate the absolute humidity, and find the maximum absolute humidity and average absolute humidity for 10 minutes. (Second Embodiment) In the first embodiment, an example in which the air permeability of the first sheet is 7000 seconds / 100 ml or less and the air permeability of the second sheet exceeds 8000 seconds / 100 ml has been described. In the second embodiment, the air permeability of the first sheet and the second sheet is as follows. That is, in this embodiment, the air permeability of the second sheet is 250 seconds / 100 ml or more and 8000 seconds / 100 ml or less, and the air permeability of the first sheet is 20% relative to the air permeability of the second sheet. the following. Hereinafter, this embodiment will be described. It should be noted that the description of the same configuration and effect as those of the first embodiment is appropriately omitted. In this embodiment, part of the second sheet 122B may be a breathable sheet having breathability, and a part may be a breathable sheet having no breathability. However, as a whole, 250 seconds / 100 ml and more are used. A condition of 8000 seconds / 100 ml or less is taken as the air permeability of the second sheet 122B. From the viewpoint of preventing the abnormal heat generation of the water vapor generating body, and the point that the water vapor generated from the water vapor generating section 121 is appropriately distributed so that the water vapor is sufficiently applied to the wearer side, the air permeability of the second sheet 122B It is preferably 4000 seconds / 100 ml or more and 7500 seconds / 100 ml or less, more preferably 5000 seconds / 100 ml or more and 7000 seconds / 100 ml or less. As long as the second sheet 122B satisfies the above-mentioned air permeability, it can be used as one or more layers of synthetic resin films or laminated on the outer surface of the one or more layers of synthetic resin films to be selected from needle-punched nonwoven fabrics and hot air. Non-woven fabrics and spunbond non-woven fabrics are represented by various types of fiber sheets, and the texture of the second sheet 122B is improved. Specifically, a two-layer film including a polyethylene film and a polyethylene terephthalate film, a laminated film including a polyethylene film and a non-woven fabric, a laminated film including a polyethylene film and a pulp sheet, and the like are used. It is preferably a laminated film comprising a polyethylene film and a pulp sheet. In this embodiment, the air permeability of the first sheet 122A of the surface of the water vapor generating body 120 on the wearer side is 20% or less of the air permeability of the second sheet 122B. From the viewpoint of appropriately distributing the water vapor generated from the water vapor generating unit 121 to fully apply the water vapor to the wearer's side, and from the viewpoint of suppressing the expansion of the water vapor generating body and preventing suffocation when the steam warm mask is worn The air permeability of the first sheet 122A is preferably 10% or less, more preferably 5% or less, even more preferably 3% or less, still more preferably 1% or less, and more preferably the air permeability of the second sheet 122B. It is preferably 0%. The air permeability of the first sheet 122A may be appropriately selected from those satisfying the condition that the air permeability of the second sheet 122B is less than 20%, and the water vapor generated from the water vapor generating section 121 is appropriately distributed to make the water vapor sufficient. From the viewpoint of application to the wearer, and from the viewpoint of suppressing the expansion of the water vapor generating body and preventing the suffocation during the wearing of the steam warm mask, more specifically, it is preferably 1600 seconds / 100 ml or less, more preferably 1000 seconds / 100 ml or less, more preferably 250 seconds / 100 ml or less, still more preferably 10 seconds / 100 ml or less, still more preferably 5 seconds / 100 ml or less, and even more preferably 0 seconds / 100 ml . As the first sheet 122A having such air permeability, it is preferable to use, for example, a porous sheet made of a synthetic resin that has moisture permeability but does not have water permeability. Specifically, it is possible to use a film obtained by stretching a polyethylene containing calcium carbonate or the like. In the case of the porous sheet, various fiber sheets selected from the group consisting of one or more types of needle-punched nonwoven fabric, hot-air nonwoven fabric, and spunbonded nonwoven fabric may be laminated on the outer surface of the porous sheet. The texture of the first sheet 122A is improved. In addition, as long as the first sheet 122A satisfies the above-mentioned air permeability, a part of the first sheet 122A may be an air-impermeable sheet having no air permeability. Next, effects produced by the steam warming mask 100 according to this embodiment will be described. That is, the steam warming mask 100 of this embodiment sets the air permeability of the second sheet 122B to 8000 seconds / 100 ml or less, and the air permeability of the first sheet 122A to the air permeability of the second sheet 122B. 20% or less, thereby preventing water vapor generated by the water vapor generating unit 121 from leaking to the outside of the mask 110 and imparting water vapor to the inside of the mask 110, that is, the wearer's side. In addition, by setting the ratio of the area occupied by the water vapor generating body 120 to 30% or more and 80% or less with respect to the entire area of the wearer-side surface of the mask body 101, it is possible to prevent the wearer from being stuffy. The absolute humidity inside the mask 110 is increased. Through the synergistic effect of these effects, people can easily breathe, and the heated water vapor can be actively generated in the mask to increase the absolute humidity in the mask, thereby improving the comfort generated by heating and humidification. Wetting with mucous membrane of throat or nose. In addition, with this effect, the discomfort caused by nasal congestion is reduced, thereby obtaining the effects of making breathing easier, improving the mucosal ciliary transport function, and promoting the function of foreign body excretion. (Third Embodiment) In the first embodiment, an example in which the storage body 104 is used as the fixing mechanism has been described. In the third embodiment, an example in which an adhesive is used as the fixing mechanism is described. In the following, descriptions of the same configurations and effects as those of the first embodiment or the second embodiment will be appropriately omitted. Fig. 7 is a partial plan view of the mask according to the third embodiment, viewed from the side of the wearer's side before the water vapor generating body is mounted on the mask. Fig. 8 is a cross-sectional view of a part of the mask according to the third embodiment as viewed from the upper surface (the eye side of the wearer). [Mask] The mask body 101 can be made of the same material as the first embodiment or the second embodiment. In this embodiment, as shown in FIG. 7, it is preferable that a marking region 105 is formed on the wearer-side surface of the mask body 101 to indicate the position where the water vapor generating body 120 is attached. As shown in FIG. 8, the water vapor generating body 120 is fixed to the mask body portion 101 via the adhesive 106 on the marking area 105. The color of the marked area 105 may be changed by printing, and embossing may be performed. In addition, the marking area 105 may be formed by setting lines such as a solid line and a dotted line around the periphery. In addition, from the viewpoint of improving the wearing feeling, a non-woven fabric (not shown) such as a hot-air non-woven fabric (not shown), which is a sheet material with good texture, may be disposed between the first sheet 122A of the water vapor generating body 120 and the wearer. ). In this case, it is preferable that the nonwoven fabric has air permeability to such an extent that it does not hinder the passage of water vapor. Furthermore, it is more preferable to have water repellency so that the non-woven fabric does not impede the passage of water vapor or the inflow of air by being wetted with water vapor. Such a non-woven fabric may be formed on the first sheet 122A of the water vapor generating body 120, or may be closed by attaching the water vapor generating body 120 to the wearer's side of the mask 110 to be opened and closed freely. . [Adhesive] In this embodiment, an adhesive 106 is provided on the surface of the water vapor generating body 120 opposite to the wearer's side, that is, the surface of the second sheet 122B opposite to the wearer's side. Accordingly, the water vapor generating body 120 can be stably fixed to the mask 110. The adhesive 106 may fix at least the water vapor generating body 120 to the mask body portion 101, and the size and shape are not particularly limited. As the adhesive 106, a hot-melt adhesive is preferably used. The hot-melt adhesive usually contains an adhesive base, an adhesion-imparting resin, and a softener as constituent components. Examples of the hot-melt adhesive include synthetic rubber-based, polyolefin-based (Polyethylene (PE, polyethylene) -based, Ethylene Vinyl Acetate (EVA, ethylene-vinyl acetate) -based, and Ethylene-Ethyl-Acrylate (EEA, ethylene- Ethyl acrylate copolymer), Atactic Polypropylene (APP, random polypropylene), Amorphous PolyAlpha Olefin (APAO, amorphous α-olefin copolymer), etc.), polyamide (Nylon, polyamide) Etc.), polyester, acrylic, etc. These can be used alone or in combination of two or more. In particular, from the aspects of storage stability, adhesion, and safety, synthetic rubber-based, polyolefin-based, acrylic-based, and amidine-based systems are preferred, and synthetic rubber-based systems are particularly preferred. The adhesive 106 is protected by a release paper in a state before use of the steam warming mask 100 and does not adhere to the outside. The release paper can be used without particular limitation. Furthermore, an adhesive may be provided on the wearer-side surface of the mask body 101. Specifically, a pair of left and right symmetrically is provided near the folding line 103 of the mask main body portion 101 and near the upper end portion of the mask main body portion 101. This makes it easy to indicate the fixed position of the water vapor generating body 120. In this case, a reusable adhesive is preferred. The embodiments of the present invention have been described above with reference to the drawings. These are examples of the present invention, and various configurations other than the above may be adopted. For example, in each of the embodiments described above, an example in which two water vapor generating bodies 120 are separately attached to the mask 110 has been described, and a structure in which two water vapor generating bodies 120 are connected by one bag body may be used. In each of the above embodiments, the description has been given of an example in which the mask main body portion 101 is formed of a single sheet, and the folding line 103 is folded symmetrically to the left and right. Two sheets, and one side is bonded to form a fold line 103. The sheet used in this case may be the same as that described in each of the above embodiments. Regarding the above embodiment, the present invention further discloses the following composition, production method, or application. <1> A steam warming mask, comprising: a mask having a mask body portion covering the nose and mouth of the wearer when worn, and a pair of hanging ear portions provided at left and right ends of the mask body portion And a water vapor generating body, which is located in the mask main body portion; and the ratio of the area occupied by the water vapor generating body to the entire area of the wearer side surface of the mask main body portion is 30% or more and 80% Hereinafter, in the case where the water vapor generating system contains a water vapor generating unit therein, the water vapor generating body includes a first sheet on a surface of the wearer side of the water vapor generating unit, and the water vapor generating unit is connected to the water vapor generating unit. On the wearer's side, the opposite side is provided with a second sheet. The air permeability of the first sheet is 7000 seconds / 100 ml or less, and the air permeability of the second sheet exceeds 8000 seconds / 100 ml. <2> A steam warming mask including: a mask including a mask body portion covering the nose and mouth of a wearer when worn, and a pair of ears provided at left and right ends of the mask body portion And a water vapor generating body, which is located in the mask main body portion; and the ratio of the area occupied by the water vapor generating body to the entire area of the wearer side surface of the mask main body portion is 30% or more and 80% Hereinafter, in the case where the water vapor generating system contains a water vapor generating unit therein, the water vapor generating body includes a first sheet on a surface of the wearer side of the water vapor generating unit, and the water vapor generating unit is connected to the water vapor generating unit. The face on the wearer's side is the opposite side with a second sheet. The air permeability of the second sheet is 250 seconds / 100 ml or more and 8000 seconds / 100 ml or less. The air permeability of the first sheet is relatively The air permeability of the second sheet is 20% or less. <3> The steam warming mask according to <1> or <2>, wherein the vertical rigidity of the water vapor generating body is preferably 30 gf / 60 mm or more in width, and more preferably 60 gf / 60 mm The width is more than 70 gf / 60 mm. <4> The steam warming mask according to any one of <1> to <3>, wherein the vertical rigidity value of the water vapor generator is preferably 150 gf / 60 mm width or less, more preferably 130 gf / 60 mm width or less, more preferably 120 gf / 60 mm width or less. <5> The steam warming mask according to any one of <1> to <4>, wherein the maximum value of the absolute humidity in the mask during use of the steam warming mask is preferably 12 g / m 3 Above, more preferably 13 g / m 3 Above, further preferably 15 g / m 3 Above, and further preferably 20 g / m 3 Above, and more preferably 25 g / m 3 the above. <6> The steam warming mask according to any one of <1> to <5>, wherein the maximum absolute humidity in the mask during use of the steam warming mask is preferably 50 g / m 3 Below, more preferably 45 g / m 3 Below, more preferably 40 g / m 3 Below, more preferably 35 g / m 3 the following. <7> The steam warming mask according to any one of <1> to <6>, wherein the ventilation resistance of the mask body is preferably 5 Pa or more, more preferably 20 Pa or more, and even more preferably 50 Pa Pa or more. <8> The steam warming mask according to any one of <1> to <7>, wherein the ventilation resistance of the mask body is preferably 200 Pa or less, more preferably 190 Pa or less, and still more preferably 180 Pa or less. <9> The steam warming mask according to any one of <1> to <8>, wherein the base weight of the mask body is preferably 5 g / m 2 Above, more preferably 10 g / m 2 Above, and further preferably 30 g / m 2 the above. <10> The steam warming mask according to any one of <1> to <9>, wherein the base weight of the mask body is preferably 200 g / m 2 Below, more preferably 150 g / m 2 Below, more preferably 120 g / m 2 the following. <11> The steam warming mask according to any one of <1> to <10>, wherein the water vapor generating portion includes an oxidizable metal, a water-absorbing agent, water, and an electrolyte. <12> The steam warming mask according to <11>, wherein the content of the water absorbing agent is preferably 0.3 parts by mass or more, more preferably 1 part by mass or more relative to 100 parts by mass of the oxidized metal. It is preferably 3 parts by mass or more. <13> The steam warming mask according to <11> or <12>, wherein the content of the water-absorbing agent is 100 parts by mass or more, preferably 100 parts by mass or less, and more preferably 80 parts by mass relative to the oxidized metal. Hereinafter, it is more preferably 60 parts by mass or less. <14> The steam warming mask according to any one of <11> to <13>, wherein the water content of the water vapor generating part is preferably 35 parts by mass or more relative to 100 parts by mass of the oxidized metal. , More preferably 40 parts by mass or more, and still more preferably 50 parts by mass or more. <15> The steam warming mask according to any one of <11> to <14>, wherein the water content of the water vapor generating portion is preferably 200 parts by mass or less with respect to 100 parts by mass of the oxidized metal, It is more preferably 150 parts by mass or less, still more preferably 100 parts by mass or less, and even more preferably 80 parts by mass or less. <16> The steam warming mask according to any one of <1> to <15>, in which the amount of water vapor generated by the water vapor generator as a whole of the water vapor generator is preferably 30 mg / unit · 10 min or more, more preferably 50 mg / unit · 10 min or more, further preferably 150 mg / unit · 10 min or more, even more preferably 250 mg / unit · 10 min or more, further more preferably 300 mg / unit · Above 10 min. <17> The steam warming mask according to any one of <1> to <16>, in which the amount of water vapor generated by the water vapor generator as a whole of the water vapor generator is preferably 1200 mg / unit · 10 min, preferably 1000 mg / unit · 10 min or less, more preferably 800 mg / unit · 10 min or less, even more preferably 700 mg / unit · 10 min or less, even more preferably 500 mg / unit · Below 10 min. <18> The steam warming mask according to any one of <1> to <17>, in which the amount of water vapor generated per unit area of the water vapor generating body is taken as the whole of the water vapor generating body, preferably 1 mg / cm 2 ・ More than 10 min, more preferably 1.5 mg / cm 2 ・ More than 10 min, more preferably 5 mg / cm 2 ・ More than 10 min, more preferably 7 mg / cm 2 ・ More than 10 min, more preferably 9 mg / cm 2 ・ 10 minutes or more. <19> The steam warming mask according to any one of <1> to <18>, wherein the amount of water vapor generated per unit area of the water vapor generating body is the entire water vapor generating body, and is preferably 20 mg / cm 2 ・ Less than 10 min, more preferably 18 mg / cm 2 ・ Less than 10 min, more preferably 15 mg / cm 2 ・ 10 minutes or less. <20> The steam warming mask according to any one of <1> to <19>, wherein the steam generating amount of the steam warming mask is preferably 60 mg / 10 min or more, and more preferably 100 mg / 10 minutes or more, more preferably 300 mg / 10 minutes or more, more preferably 500 mg / 10 minutes or more, and even more preferably 600 mg / 10 minutes or more. <21> The steam warming mask according to any one of <1> to <20>, wherein the steam generating amount of the steam warming mask is preferably 2000 mg / 10 min or less, and more preferably 1400 mg / 10 minutes or less, more preferably 1000 mg / 10 minutes or less. <22> The steam warming mask according to any one of <1> to <21>, wherein the average value of the absolute humidity in the mask during use of the steam warming mask is preferably 11.7 g / m 3 Above, more preferably 12 g / m 3 Above, further preferably 13 g / m 3 Above, further preferably 15 g / m 3 Above, and more preferably 19 g / m 3 the above. <23> The steam warming mask according to any one of <1> to <22>, wherein the average value of the absolute humidity in the mask during use of the steam warming mask is preferably 35 g / m 3 Below, more preferably 30 g / m 3 Below, more preferably 25 g / m 3 the following. [Examples] The following examples further describe the embodiments of the present invention in detail. The examples are for the purpose of illustration and do not limit the scope of the invention. [Example A] (Example A1) A steam warming mask 100 similar to that described in the first embodiment was produced. The details are as follows. <Preparation of water vapor generating part 121> The exothermic composition of the composition shown in Table 1 was prepared by the following procedures. The viscosity-increasing agent was dissolved in water, and then tripotassium phosphate was dissolved to prepare an aqueous solution. On the other hand, a powder prepared by pre-mixing iron powder and activated carbon was prepared, and the pre-mixed powder was put into the above aqueous solution, and was stirred at 150 rpm for 10 minutes by a disc turbine-type stirring blade to obtain a slurry of Fever composition. Then, on one side of the base material layer 121B, a nozzle coating method was used, and each water vapor generating portion 121 (4.9 cm × 4.9 cm; area 24.0 cm) 2 ) The resulting exothermic composition was applied in a manner of 1.4 g. Further, on the coated surface, a salt (pharmacopoeia sodium chloride (manufactured by Otsuka Pharmaceutical Co., Ltd.)) was sprayed so that each of the water vapor generating portions 121 (same as above) became 0.07 g, and a water vapor generating layer 121A was formed thereon and superposed thereon. The water-retaining sheet 121C produces a water vapor generating unit 121. As the base material layer 121B, a basis weight of 27 g / m was used. 2 Polyethylene film. As the water-retaining sheet 121C, wood pulp paper (weighing 20 g / m 2 , Manufactured by Ino Paper Co., Ltd.), water-absorbing polymer (sodium polyacrylate, spherical, average particle size 300 μm, weighing 50 g / m 2 , Aqualic CA, manufactured by Japan Catalyst Co., Ltd., and wood pulp paper (basic weight 30 g / m 2 , Manufactured by Ino Paper Co., Ltd.) a polymer sheet laminated and integrated. The water vapor generating part 121 obtained in this way was superimposed on two layers (mass 3.43 g) so that the water-retaining sheet 121C was placed on the skin side (the first sheet 122A side). The water content in the water vapor generating portion 121 immediately after the production was 62 parts by mass based on 100 parts by mass of the iron powder. [Table 1] <Production of water vapor generating body 120> The entire water vapor generating portion 121 obtained by coating the bag body 122 including the first sheet material 122A and the second sheet material 122B having the air permeability described in Table 3, and producing water vapor generating material.体 120。 Body 120. Specifically, as the first sheet 122A of the water vapor generating body 120 (the same applies hereinafter), two laminated TMS nonwovens (heat-bonded (PET / PE) -melt-blown (polypropylene) -spun-bonded (polypropylene)) Multilayer integrated type, basis weight 50 g / m 2 , Manufactured by Kuraray Co., Ltd.), a sheet with an air permeability of 0 seconds / 100 ml. As the second sheet 122B of the water vapor generating body 120 (the same applies hereinafter), a basis weight of 40 g / m is obtained by laminating a 100% by mass polyethylene film and a pulp sheet. 2 Of air-impermeable sheet. A water vapor generating portion 121 is disposed between the first sheet material 122A and the second sheet material 122B, and the peripheral edge portion is hermetically sealed to obtain a water vapor generating body 120. At this time, the base material layer 121B of the water vapor generating portion 121 is disposed on the second sheet 122B side. At this time, the area of the first sheet 122A including the air-permeable surface and the sealing portion was 39.7 cm. 2 (6.3 cm x 6.3 cm). The water vapor generator 120 was stored in an oxygen blocking bag before the evaluation described below was performed. <Production of the steam warm mask 100> As a sheet material constituting the mask body 101 of the mask 110, an SMS non-woven fabric (spunbond (polypropylene)-meltblown (polypropylene)-spunbond (polypropylene) is laminated and integrated type, Basis weight 50 g / m 2 ) Becomes the outer side, and a spunbond non-woven fabric (polypropylene) having a basis weight of 25 g becomes the inner side (wearer side) so that two layers are overlapped. At this time, the blocking rate of particles of 0.3 μm or more in the mask body 101 was 25%. The fold line 103 of the longitudinal center of the mask body 101 is placed on both sides above the upper portion of the mask body 104, and the upper portion of the mask body 104 is heat-melted. . The elastic ear-shaped ear-hanging portion 102 having a stretchable rubber band is attached to an end portion of the mask body portion 101 to produce a mask 110 having a three-dimensional shape. When the ventilation resistance of the mask body 101 was measured on the container body portion, it was 148 Pa / 30 mmΦ · pressure difference. Furthermore, in the following evaluation, one (2) water vapor generating bodies 120 were placed in the storage body 104 from the upper side of the two non-woven masks 110 of the mask body 101, which were not hot-melted. A pair of water vapor generating bodies 120 are installed symmetrically around the fold line 103 of the mask body portion 101 and near the upper end portion (nose side) of the mask body portion 101 to form a steam warming mask 100. In this embodiment, the entire area of the face on the wearer's side of the mask body 101 is calculated by the following method. Fold the mask body 101 longitudinally at the center, vertically connect the line (A line) connecting the most separated points up and down to the point on the folding line that is furthest away from the front end, and set the ear side end of the sealing part as the mask. The front end is cut along a line (line C) parallel to the A line passing through the front end of the mask (line B) in the direction of the mounting ears, and further, the sealing portion is cut. Copy the outer circumference of the cut mask body to A4 paper (manufactured by TOPPAN FORMS, recycle cut G80A4W, base weight 64 g / m 2 , 21.0 cm × 29.7 cm: area 623.7 cm 2 ), Cut out the peripheral part with scissors, and measure the quality of the cut paper. Based on the conversion of the total mass of A4 paper to twice the mass of the cut paper and the total area of A4 paper, the total area of the face on the wearer side of the mask body 101 was 152.0 cm. 2 The ratio of the area of the two left and right water vapor generating bodies 120 to the entire area of the wearer-side surface of the mask body 101 is 52%. (Examples A2 and A3) As the first sheet 122A of the water vapor generator 120, an air permeability of 4.0 seconds / 100 ml and a basis weight of 40 g / m were used. 2 A synthetic pulp paper (trade name: Eleven MOA, manufactured by TOKAI PULP Co., Ltd.) was laminated with one sheet in Example A2, and two sheets were laminated in Example A3. Other than that, a steam warming mask 100 was produced in the same manner as in Example A1. (Examples A4 to A8) As the first sheet 122A of the water vapor generator 120, a basis weight of 50 g / m having the air permeability described in Table 3 was used. 2 Except for the calcium carbonate-containing polyethylene film (trade name: TSF-EU, manufactured by Hingren Co., Ltd.), a steam warming mask 100 was produced in the same manner as in Example A1. (Examples A9 to A11) As the second sheet 122B of the water vapor generator 120, a basis weight of 50 g / m having the air permeability described in Table 3 was used. 2 Except for the calcium carbonate-containing polyethylene film (trade name: TSF-EU, manufactured by Hingren Co., Ltd.), a steam warming mask 100 was produced in the same manner as in Example A1. (Examples A12, A13, and Comparative Example A1) The water vapor generating portion 121 (4.9 cm × 4.9 cm; area 24.0 cm) of Example A1 was used 2 ) Cut to 3.3 cm × 3.3 cm (area 10.9 cm 2 ) As the water vapor generating unit. In the production of the water vapor generating body, the sizes of the first sheet and the second sheet were set to 4.8 cm × 4.8 cm (area 23.0 cm) in Example A12. 2 ), 5.5 cm × 5.5 cm (area 30.3 cm) in Example A13 2 ), Set to 3.9 cm × 3.9 cm (area 15.2 cm 2 ), A water vapor generating portion 121 is disposed between the sheets, and the peripheral edge portion is hermetically sealed to obtain a water vapor generating body 120. Other than that, a steam warming mask 100 was produced in the same manner as in Example A1, and the ratio of the area of the water vapor generating body 120 to the entire area of the wearer-side surface of the mask body 101 was set as a table. 3 records. (Examples A14, A15, and Comparative Example A2) In the production of the water vapor generating portion 121, the following was produced: When the nozzle of the heat-generating composition was applied to one side of the substrate layer 121B, one piece of water was applied. The size of the steam generating portion 121 was set to 4.9 cm × 6.5 cm (area 31.9 cm) in Example A14. 2 ), Set to 4.9 cm × 7.5 cm (area 36.8 cm) in Example A15 2 ), Set to 4.9 cm x 8.5 cm (area 41.7 cm) in Comparative Example A2 2 ), And the coating amount of the heat-generating composition was the same as that of Example A1 (converted to 1.4 g per 4.9 cm × 4.9 cm). In the production of the water vapor generating body, the sizes of the first sheet and the second sheet were set to 6.3 cm × 8.4 cm (area 52.9 cm) in Example A14. 2 ), Set to 6.3 cm × 9.6 cm (area 60.5 cm) in Example A15 2 ), Set to 6.4 cm x 10.6 cm (area 67.8 cm) in Comparative Example A2 2 ), A water vapor generating portion 121 is disposed between the sheets, and the peripheral edge portion is hermetically sealed to obtain a water vapor generating body 120. Other than that, a steam warming mask 100 was produced in the same manner as in Example A1, and the ratio of the area of the water vapor generating body 120 to the entire area of the wearer-side surface of the mask body 101 was set as a table. 3 records. (Examples A16 and A17) As the water vapor generating portion, only one layer of the water vapor generating portion 121 used in Example A1 was used, and the first sheet having the air permeability shown in Table 3 was used. In Example A1, a water vapor generating body 120 was produced. For Example A16, a steam warming mask 100 was made in the same way as in Example A1, and for Example A17, when making a steam warming mask, in addition to the water vapor generating body produced, it was also used with water. One layer of the steam generating body was connected to each other, and one piece of ADVANTEC (registered trademark) qualitative filter paper No. 2 having a size of 63 mm square was laminated, and a steam warming mask 100 was produced. (Examples A18 and A19) As a water vapor generating portion, a powdery exothermic composition having the composition shown in Table 2 was prepared as follows. Under a stream of nitrogen, iron powder, water, common salt, water-absorbing polymer, and activated carbon were mixed to make a uniform water vapor generating part. In the production of the water vapor generating body 120, for Example A18, the sheet-shaped water vapor generating section 121 in Example A1 was replaced, and for Example A19, the sheet-shaped water vapor generating section in Example A8 was replaced. 121. A steam warming mask 100 was produced in the same manner as in Example A1 except that 2.8 g of the above-mentioned powdery water vapor generating portions were used. [Table 2] (Comparative Examples A3 and A4) As the first sheet 122A of the water vapor generator 120, a basis weight of 50 g / m was used 2 , TSF-EU, calcium carbonate-containing polyethylene film manufactured by Xingren Co., Ltd. For Comparative Example A3, a film having a permeability of 8000 seconds / 100 ml is used, and for Comparative Example A4, a film having a permeability of 10000 seconds / 100 ml is used Other than that, a steam warming mask 100 was produced in the same manner as in Example A1. The oxygen blocking bag (packaging material) was unsealed, the produced water vapor generator 120 was taken out, and it was quickly attached to the mask 110 to perform the following evaluations. The results are shown in Table 3. [Measurement of Rigidity Value of Water Vapor Generator] Using a Tensilon universal testing machine (ORIENTEC RTC-1150A), the bending rigidity value of the mask assembly was measured. Cut the folding line of the mask body and use one side of the mask, and measure the bending rigidity with the unit of water vapor generator inserted into the mask container. The measurement conditions are that the water vapor generating body is supported with a span distance of 30 mm, and a plate-shaped pressing member with a width of 60 mm and a front end radius of 5 mm is used to cross the test piece (water vapor generating body) at a crosshead speed of 20 mm / min Load applied. The peak load at this time (the average of 3 measurements) was set to a rigid value. [Measurement of water vapor generation amount (water vapor generation body)] Prepare a test machine with an internal volume of 4.2 liters and an internal humidity of 1 RH% or less, which can supply dry air of 2.1 liters / min in a closed system. The water vapor generating body 120 of a specific size is allowed to stand still so that the water vapor can be evapotranspiration and heat is generated. Then, the humidity of the air discharged outside the closed system was measured with a hygrometer, and the amount of water vapor generated after the start of the heat was determined using the following formula (1), and the amount of water vapor per unit time was set. e is the water vapor pressure (Pa), es is the saturated water vapor pressure (Pa: quoted from JIS Z8806), T is the temperature (° C: dry bulb temperature), and s is the sampling period (seconds). Relative humidity U (% RH) = (e / es) × 100 Absolute humidity D (g / m 3 ) = (0.794 × 10 -2 × e) / (1 + 0.00366T) = (0.794 × 10 -2 × U × es) / [100 × (1 + 0.00366T)] Unit air volume P (liter) = (2.1 × s) / 60 Amount of water vapor generated per unit time A (g) = (P × D) / 1000 ・ ・ ・ (1) [Expansion of water vapor heating element] Human body made from male head data of DIGITAL HUMAN TECHNOLOGY Co., Ltd. (average of 52 Japanese adult males) at 20 ° C and 60% RH Head model (hereinafter referred to as "human body model") after wearing the mask for 30 minutes, take out the water vapor generator from the mask body, and suck the inside of the water vapor generator with a syringe (the inside closed by the skin side sheet and the outer sheet) Gas, and measure the volume. The measurement was performed twice, and the average value was set as a measurement value. [Measurement of water vapor generation amount (steam warming mask)] The water vapor generation amount was measured by the above-mentioned method for measuring the water vapor generation amount to the water vapor generating body. [Measurement of Breathing Resistance of Mask Body 101] The ventilation resistance of the mask body 101 was measured using a mask tester MTS-2 (Shibata Science). On the upper part of the mask tester MTS-2 (made by Shibata Scientific), a sheet material arranged from the mask body portion 101 is cut out into a sheet having a size of 3.5 cm × 3.5 to 5 cm × 5 cm, and fixed by the sheet. Fix with omissions. The test area is 7 cm 2 (3 cmΦ), the test flow rate was 10 L / min., And the measurement was performed for 10 seconds. The ventilation resistance was calculated from the differential pressure between the air inflow side (inlet side) and the air outflow side (outlet side) of the sheet, and it was 148 Pa. [Measurement of Absolute Humidity in Mask] At 20 ° C and 60% RH, install a thermo-hygrometer (SHT75 manufactured by Sensirion) under the nose of the human body model, and use a ventilator (HARVARD APPARATUS) from the nose of the head model DUAL PHASE CONTROL RESPIRATOR (manufactured by HARVARD APPARATUS)), which simulates a person's breathing rhythm and inhales at a frequency of 500 ml each time, 15 times a minute. In this state, the steam warming mask 100 is worn on a human body model, and changes in temperature and humidity are measured. According to the temperature and relative humidity, calculate the absolute humidity, and find the maximum absolute humidity and average absolute humidity for 10 minutes. [Evaluation of mask wearing feeling (warmness, persistence, vapor (wet feeling), stuffiness)] Five male functional inspectors evaluated the wearing feeling of the mask at 22 ° C. The feeling of warmth, continuity, steam (wetness), and stuffiness in the state of wearing the mask were evaluated according to the following criteria, and the score with the largest number of people was selected for scoring. Warm feeling 1: Compared with the mask body alone, it is difficult to feel the difference in warmth 2: Compared with the mask body alone, it is warmer 3: Compared with the mask body alone, it is obviously warm and moderately warm 4: Compared with the mask body alone The mask body is obviously warmer but slightly warmer 5: Compared with the mask body alone, it is significantly warmer but hotter than lasting 1: The comfort temperature and steam sense last less than 5 minutes 2: The comfort temperature and steam The duration of the sensation is 5 minutes or more and less than 10 minutes 3: The duration of the comfortable temperature and steam sensation is more than 10 minutes. It is difficult to feel the difference in moist feeling 2: Compared with the mask body alone, the mucosa of the throat or nose is slightly moist 3: Compared with the mask body alone, the moist feeling of the throat or nose 4: Compared with the mask body alone, the laryngeal or nasal mucosa is superior in moisturization5: Compared with the mask body alone, the laryngeal or nasal mucous membrane is very excellent in moistness1: Compared with the mask body, very muggy 2: Compared with the mask Compared to the body, it is more stuffy 3: Compared with the mask body, it is slightly sulking 4: Compared with the mask body, it is almost suffocated 5: The same as the mask body, it is not suffocated at all [Table 3] [Example B] (Example B1) A steam warming mask 100 having the same shape as that of the above-mentioned Example A was produced. The details are as follows. <Preparation of Water Vapor Generation Unit 121> The water vapor generation unit 121 was produced by the same method as in Example A1 above using the heat generating composition having the composition shown in Table 1. <Production of water vapor generating body 120> The entire water vapor generating portion 121 obtained by coating the bag body 122 including the first sheet material 122A and the second sheet material 122B having the air permeability described in Table 4 is used to produce water vapor generating material.体 120。 Body 120. Specifically, as the first sheet 122A of the water vapor generating body 120 (the same applies hereinafter), a TMS nonwoven fabric (heat-bonded (PET / PE) -melt-blown (polypropylene) -spun-bonded (polypropylene) is laminated Body type, basis weight 50 g / m 2 , Manufactured by Kuraray Co., Ltd.) A sheet with 2 layers and an air permeability of 0 seconds / 100 ml. As the second sheet 122B of the water vapor generating body 120 (the same applies hereinafter), an air permeability of 7000 seconds / 100 ml and a basis weight of 50 g / m were used. 2 (Trade name: TSF-EU, manufactured by Xingren Co., Ltd.), a calcium carbonate-containing polyethylene film. A water vapor generating portion 121 is disposed between the first sheet material 122A and the second sheet material 122B, and the peripheral edge portion is hermetically sealed to obtain a water vapor generating body 120. At this time, the base material layer 121B of the water vapor generating portion 121 is disposed on the second sheet 122B side. At this time, the area of the air-permeable surface (the first sheet 122A) was 6.3 cm × 6.3 cm (area 39.7 cm). 2 ) (The area ratio of the area of the water vapor generating portion 121 to the air-permeable surface is 60.5%). The water vapor generator 120 was stored in an oxygen blocking bag before the evaluation described below was performed. <Production of the steam warming mask 100> The steam warming mask 100 was manufactured by the same method as the said Example A1. (Examples B2 and B3) As the first sheet 122A of the water vapor generator 120, an air permeability of 4.0 seconds / 100 ml and a basis weight of 40 g / m were used. 2 (Commercial name: Eleven MOA, manufactured by TOKAI PULP). In Example B2, this synthetic pulp paper was overlapped by 1 sheet, and in Example B3, 2 sheets were laminated. Other than that, a steam warming mask 100 was produced in the same manner as in Example B1. (Example B4) As the first sheet 122A of the water vapor generator 120, an air permeability of 250 seconds / 100 ml and a basis weight of 50 g / m were used. 2 (Trade name: TSF-EU, manufactured by Xingren Co., Ltd.), a calcium carbonate-containing polyethylene film. Other than that, a steam warming mask 100 was produced in the same manner as in Example B1. (Examples B5 to B9) As the second sheet material 122B of the water vapor generator 120, a basis weight of 50 g / m having the air permeability described in Table 4 was used. 2 Except for the calcium carbonate-containing polyethylene film (trade name: TSF-EU, manufactured by Hingren Co., Ltd.), a steam warming mask 100 was produced in the same manner as in Example B1. (Examples B10, B11, and Comparative Example B1) The water vapor generating portion 121 (4.9 cm × 4.9 cm; area 24.0 cm) of Example B1 was used 2 ) Cut to 3.3 cm × 3.3 cm (area 10.9 cm 2 ) As the water vapor generating unit. In the production of the water vapor generating body, the size of the first sheet and the second sheet was set to 4.8 cm × 4.8 cm (area 23.0 cm) in Example B10. 2 ), 5.5 cm × 5.5 cm (area 30.3 cm) in Example B11 2 ), Set to 3.9 cm x 3.9 cm (area 15.2 cm 2 ), A water vapor generating portion 121 is disposed between the sheets, and the peripheral edge portion is hermetically sealed to obtain a water vapor generating body 120. Other than that, a steam warming mask 100 was produced in the same manner as in Example B1, and the ratio of the area of the water vapor generating body 120 to the entire area of the wearer-side surface of the mask body 101 was set as a table. 4 recorded. (Examples B12, B13, and Comparative Example B2) In the production of the water vapor generating portion 121, production was performed in the following manner: When a heating composition is applied to the single-sided die of the base material layer 121B, one water vapor is generated. The size of the portion 121 is set to 4.9 cm × 6.5 cm (area 31.9 cm) in Example B12. 2 ), Set to 4.9 cm × 7.5 cm (area 36.8 cm) in Example B13 2 ), Set to 4.9 cm x 8.5 cm (area 41.7 cm) in Comparative Example B2 2 ), And the coating amount of the heat-generating composition was the same as that of Example B1 (converted to 1.4 g per 4.9 cm × 4.9 cm). In the production of the water vapor generating body, the sizes of the first sheet and the second sheet were set to 6.3 cm × 8.4 cm (area 52.9 cm) in Example B12. 2 ), Set to 6.3 cm × 9.6 cm (area 60.5 cm) in Example B13 2 ), Set to 6.4 cm x 10.6 cm (area 67.8 cm) in Comparative Example B2 2 ), A water vapor generating portion 121 is disposed between the sheets, and the peripheral edge portion is hermetically sealed to obtain a water vapor generating body 120. Other than that, a steam warming mask 100 was produced in the same manner as in Example B1, and the ratio of the area of the water vapor generating body 120 to the entire area of the wearer-side surface of the mask body 101 was set as a table. 4 recorded. (Examples B14 and B15) As the water vapor generating portion, only one layer of the water vapor generating portion 121 used in Example B1 was used, and the first sheet having the air permeability shown in Table 4 was used. In Example B1, a water vapor generating body 120 was produced. For Example B14, a steam warming mask 100 was made in the same manner as in Example B1, except for Example B15, when making a steam warming mask, in addition to the water vapor generating body produced, it was also used with water. One layer of the steam generating body was connected to each other, and one piece was cut and cut into 63 mm square ADVANTEC (registered trademark) qualitative filter paper No. 2 to make a steam warming mask 100. (Example B16) As a water vapor generating portion, a powdery exothermic composition having the composition shown in Table 2 was prepared in the following procedure. Under a stream of nitrogen, iron powder, water, common salt, water-absorbing polymer, and activated carbon were mixed to make a uniform water vapor generating part. In the production of the water vapor generating body 120, the sheet-shaped water vapor generating portion 121 in Example B1 was replaced, and 2.8 g of the above-mentioned powdery water vapor generating portion was used, except that it was the same as in Example B1. Method of making a steam warming mask 100. (Comparative Examples B3 and B4) As the first sheet 122A and the second sheet 122B of the water vapor generating body 120, the air permeability shown in Table 4 and the basis weight of 50 g / m were used. 2 Except for TSF-EU, a calcium carbonate-containing polyethylene film manufactured by Xingren Co., Ltd., a steam warming mask 100 was produced in the same manner as in Example B1. The oxygen blocking bag (packaging material) was unsealed, the produced water vapor generator 120 was taken out, and it was quickly attached to the mask 110 to perform the same evaluation as in Example A. The results are shown in Table 4. [Table 4]